diff --git a/test/fixtures/clustered-server/app.js b/test/fixtures/clustered-server/app.js
index 3fca2aaa42fa9d..f89d70ee8f8ca6 100644
--- a/test/fixtures/clustered-server/app.js
+++ b/test/fixtures/clustered-server/app.js
@@ -1,6 +1,6 @@
 var http = require('http');
 var cluster = require('cluster');
-var common = require('../../common.js');
+var common = require('../../common');
 
 function handleRequest(request, response) {
   response.end('hello world\n');
diff --git a/test/gc/test-http-client-connaborted.js b/test/gc/test-http-client-connaborted.js
index 4fbb4292987f99..c58b4d5f752457 100644
--- a/test/gc/test-http-client-connaborted.js
+++ b/test/gc/test-http-client-connaborted.js
@@ -11,7 +11,7 @@ var http  = require('http'),
     count   = 0,
     countGC = 0,
     todo    = 500,
-    common = require('../common.js'),
+    common = require('../common'),
     assert = require('assert'),
     PORT = common.PORT;
 
diff --git a/test/gc/test-http-client-onerror.js b/test/gc/test-http-client-onerror.js
index 80a3fcf5b6cde9..bf9fb7c1fba9f8 100644
--- a/test/gc/test-http-client-onerror.js
+++ b/test/gc/test-http-client-onerror.js
@@ -13,7 +13,7 @@ var http  = require('http'),
     count   = 0,
     countGC = 0,
     todo    = 500,
-    common = require('../common.js'),
+    common = require('../common'),
     assert = require('assert'),
     PORT = common.PORT;
 
diff --git a/test/gc/test-http-client-timeout.js b/test/gc/test-http-client-timeout.js
index 99a97d73b751cd..727d133f711ad8 100644
--- a/test/gc/test-http-client-timeout.js
+++ b/test/gc/test-http-client-timeout.js
@@ -15,7 +15,7 @@ var http  = require('http'),
     count   = 0,
     countGC = 0,
     todo    = 550,
-    common = require('../common.js'),
+    common = require('../common'),
     assert = require('assert'),
     PORT = common.PORT;
 
diff --git a/test/gc/test-http-client.js b/test/gc/test-http-client.js
index 4c64bbadbb9562..6aedda7edef755 100644
--- a/test/gc/test-http-client.js
+++ b/test/gc/test-http-client.js
@@ -11,7 +11,7 @@ var http  = require('http'),
     count   = 0,
     countGC = 0,
     todo    = 500,
-    common = require('../common.js'),
+    common = require('../common'),
     assert = require('assert'),
     PORT = common.PORT;
 
diff --git a/test/gc/test-net-timeout.js b/test/gc/test-net-timeout.js
index 5d2387dc748bae..2ef03b2632d045 100644
--- a/test/gc/test-net-timeout.js
+++ b/test/gc/test-net-timeout.js
@@ -22,7 +22,7 @@ var net  = require('net'),
     count   = 0,
     countGC = 0,
     todo    = 500,
-    common = require('../common.js'),
+    common = require('../common'),
     assert = require('assert'),
     PORT = common.PORT;
 
diff --git a/test/message/error_exit.js b/test/message/error_exit.js
index 64738674c2045a..51c25697494878 100644
--- a/test/message/error_exit.js
+++ b/test/message/error_exit.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 
 process.on('exit', function(code) {
diff --git a/test/parallel/test-cli-eval.js b/test/parallel/test-cli-eval.js
index 26e3e0ad0bd6e1..fd9cd410d5ea93 100644
--- a/test/parallel/test-cli-eval.js
+++ b/test/parallel/test-cli-eval.js
@@ -4,7 +4,7 @@ if (module.parent) {
   process.exit(42);
 }
 
-var common = require('../common.js'),
+var common = require('../common'),
     assert = require('assert'),
     child = require('child_process'),
     nodejs = '"' + process.execPath + '"';
diff --git a/test/parallel/test-domain-exit-dispose-again.js b/test/parallel/test-domain-exit-dispose-again.js
index 3a72e3aac6adad..c651181092737b 100644
--- a/test/parallel/test-domain-exit-dispose-again.js
+++ b/test/parallel/test-domain-exit-dispose-again.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var domain = require('domain');
 var disposalFailed = false;
diff --git a/test/parallel/test-domain-exit-dispose.js b/test/parallel/test-domain-exit-dispose.js
index 5293d69b6db3fe..a01cee5c73cb0c 100644
--- a/test/parallel/test-domain-exit-dispose.js
+++ b/test/parallel/test-domain-exit-dispose.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var domain = require('domain');
 var disposalFailed = false;
diff --git a/test/parallel/test-domain-http-server.js b/test/parallel/test-domain-http-server.js
index 2c0574276c6fc7..77e10911716fb0 100644
--- a/test/parallel/test-domain-http-server.js
+++ b/test/parallel/test-domain-http-server.js
@@ -1,7 +1,7 @@
 var domain = require('domain');
 var http = require('http');
 var assert = require('assert');
-var common = require('../common.js');
+var common = require('../common');
 
 var objects = { foo: 'bar', baz: {}, num: 42, arr: [1,2,3] };
 objects.baz.asdf = objects;
diff --git a/test/parallel/test-domain-timers.js b/test/parallel/test-domain-timers.js
index 8c11d7edc5afbe..5a34bc7449a951 100644
--- a/test/parallel/test-domain-timers.js
+++ b/test/parallel/test-domain-timers.js
@@ -1,6 +1,6 @@
 var domain = require('domain');
 var assert = require('assert');
-var common = require('../common.js');
+var common = require('../common');
 
 var timeout_err, timeout, immediate_err;
 
diff --git a/test/parallel/test-http-exit-delay.js b/test/parallel/test-http-exit-delay.js
index fce01b5c51390c..191b96d28b1e74 100644
--- a/test/parallel/test-http-exit-delay.js
+++ b/test/parallel/test-http-exit-delay.js
@@ -1,5 +1,5 @@
 var assert = require('assert');
-var common = require('../common.js');
+var common = require('../common');
 var http = require('http');
 
 var start;
diff --git a/test/parallel/test-http-set-timeout-server.js b/test/parallel/test-http-set-timeout-server.js
index 95a3124d14aa8b..ccad6f1f3a398e 100644
--- a/test/parallel/test-http-set-timeout-server.js
+++ b/test/parallel/test-http-set-timeout-server.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var http = require('http');
 var net = require('net');
diff --git a/test/parallel/test-https-set-timeout-server.js b/test/parallel/test-https-set-timeout-server.js
index f33c85a2c2ebae..c5058e521180ba 100644
--- a/test/parallel/test-https-set-timeout-server.js
+++ b/test/parallel/test-https-set-timeout-server.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var https = require('https');
 var tls = require('tls');
diff --git a/test/parallel/test-repl-domain.js b/test/parallel/test-repl-domain.js
index 6c3048e2682927..929cb0ffd1e80f 100644
--- a/test/parallel/test-repl-domain.js
+++ b/test/parallel/test-repl-domain.js
@@ -1,5 +1,5 @@
 var assert = require('assert');
-var common = require('../common.js');
+var common = require('../common');
 
 var util   = require('util');
 var repl   = require('repl');
diff --git a/test/parallel/test-repl-timeout-throw.js b/test/parallel/test-repl-timeout-throw.js
index 2febf2e3ce0565..f171341345179e 100644
--- a/test/parallel/test-repl-timeout-throw.js
+++ b/test/parallel/test-repl-timeout-throw.js
@@ -1,5 +1,5 @@
 var assert = require('assert');
-var common = require('../common.js');
+var common = require('../common');
 
 var spawn = require('child_process').spawn;
 
diff --git a/test/parallel/test-signal-safety.js b/test/parallel/test-signal-safety.js
index 4707b634dad48b..b037232a6b89f7 100644
--- a/test/parallel/test-signal-safety.js
+++ b/test/parallel/test-signal-safety.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var Signal = process.binding('signal_wrap').Signal;
 
diff --git a/test/parallel/test-stream-push-order.js b/test/parallel/test-stream-push-order.js
index 1d7d09d8b1e30f..5e403c7824beaf 100644
--- a/test/parallel/test-stream-push-order.js
+++ b/test/parallel/test-stream-push-order.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var Readable = require('stream').Readable;
 var assert = require('assert');
 
diff --git a/test/parallel/test-stream2-base64-single-char-read-end.js b/test/parallel/test-stream2-base64-single-char-read-end.js
index bf049e3b628e02..2082c714cc69a5 100644
--- a/test/parallel/test-stream2-base64-single-char-read-end.js
+++ b/test/parallel/test-stream2-base64-single-char-read-end.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var R = require('_stream_readable');
 var W = require('_stream_writable');
 var assert = require('assert');
diff --git a/test/parallel/test-stream2-compatibility.js b/test/parallel/test-stream2-compatibility.js
index ce6a5111a0c80a..72b1e428505988 100644
--- a/test/parallel/test-stream2-compatibility.js
+++ b/test/parallel/test-stream2-compatibility.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var R = require('_stream_readable');
 var assert = require('assert');
 
diff --git a/test/parallel/test-stream2-finish-pipe.js b/test/parallel/test-stream2-finish-pipe.js
index df7d7a14efd89a..beabea0f0e5728 100644
--- a/test/parallel/test-stream2-finish-pipe.js
+++ b/test/parallel/test-stream2-finish-pipe.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var stream = require('stream');
 var Buffer = require('buffer').Buffer;
 
diff --git a/test/parallel/test-stream2-large-read-stall.js b/test/parallel/test-stream2-large-read-stall.js
index c76c300d50fc65..55d25a9b7366df 100644
--- a/test/parallel/test-stream2-large-read-stall.js
+++ b/test/parallel/test-stream2-large-read-stall.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 
 // If everything aligns so that you do a read(n) of exactly the
diff --git a/test/parallel/test-stream2-objects.js b/test/parallel/test-stream2-objects.js
index e99ac09a3b2212..d7c532917962da 100644
--- a/test/parallel/test-stream2-objects.js
+++ b/test/parallel/test-stream2-objects.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var Readable = require('_stream_readable');
 var Writable = require('_stream_writable');
 var assert = require('assert');
diff --git a/test/parallel/test-stream2-pipe-error-once-listener.js b/test/parallel/test-stream2-pipe-error-once-listener.js
index c8b9350a2ab2c2..0dbe8782e92229 100644
--- a/test/parallel/test-stream2-pipe-error-once-listener.js
+++ b/test/parallel/test-stream2-pipe-error-once-listener.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 
 var util = require('util');
diff --git a/test/parallel/test-stream2-push.js b/test/parallel/test-stream2-push.js
index c42bb6d9b488d8..9268f052a2381a 100644
--- a/test/parallel/test-stream2-push.js
+++ b/test/parallel/test-stream2-push.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var stream = require('stream');
 var Readable = stream.Readable;
 var Writable = stream.Writable;
diff --git a/test/parallel/test-stream2-readable-from-list.js b/test/parallel/test-stream2-readable-from-list.js
index b0bedac5e7c44c..3604ae3ec361cb 100644
--- a/test/parallel/test-stream2-readable-from-list.js
+++ b/test/parallel/test-stream2-readable-from-list.js
@@ -1,5 +1,5 @@
 var assert = require('assert');
-var common = require('../common.js');
+var common = require('../common');
 var fromList = require('_stream_readable')._fromList;
 
 // tiny node-tap lookalike.
diff --git a/test/parallel/test-stream2-readable-non-empty-end.js b/test/parallel/test-stream2-readable-non-empty-end.js
index 72b952a95a290d..d77564cacb7535 100644
--- a/test/parallel/test-stream2-readable-non-empty-end.js
+++ b/test/parallel/test-stream2-readable-non-empty-end.js
@@ -1,5 +1,5 @@
 var assert = require('assert');
-var common = require('../common.js');
+var common = require('../common');
 var Readable = require('_stream_readable');
 
 var len = 0;
diff --git a/test/parallel/test-stream2-set-encoding.js b/test/parallel/test-stream2-set-encoding.js
index e4e14952182348..47f078935bd03d 100644
--- a/test/parallel/test-stream2-set-encoding.js
+++ b/test/parallel/test-stream2-set-encoding.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var R = require('_stream_readable');
 var util = require('util');
diff --git a/test/parallel/test-stream2-transform.js b/test/parallel/test-stream2-transform.js
index 5c5d6333b79032..3bdef8fbf626e4 100644
--- a/test/parallel/test-stream2-transform.js
+++ b/test/parallel/test-stream2-transform.js
@@ -1,5 +1,5 @@
 var assert = require('assert');
-var common = require('../common.js');
+var common = require('../common');
 var PassThrough = require('_stream_passthrough');
 var Transform = require('_stream_transform');
 
diff --git a/test/parallel/test-stream2-unpipe-drain.js b/test/parallel/test-stream2-unpipe-drain.js
index 1c27cf8771216a..d593b6a68f7e94 100644
--- a/test/parallel/test-stream2-unpipe-drain.js
+++ b/test/parallel/test-stream2-unpipe-drain.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var stream = require('stream');
 var crypto = require('crypto');
diff --git a/test/parallel/test-stream2-unpipe-leak.js b/test/parallel/test-stream2-unpipe-leak.js
index 8bfc2a630e9cd9..fae2b73ac4f6cf 100644
--- a/test/parallel/test-stream2-unpipe-leak.js
+++ b/test/parallel/test-stream2-unpipe-leak.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var stream = require('stream');
 
diff --git a/test/parallel/test-stream2-writable.js b/test/parallel/test-stream2-writable.js
index 5df3b18717f636..d90a2b6f75c468 100644
--- a/test/parallel/test-stream2-writable.js
+++ b/test/parallel/test-stream2-writable.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var W = require('_stream_writable');
 var D = require('_stream_duplex');
 var assert = require('assert');
diff --git a/test/parallel/test-zlib-close-after-write.js b/test/parallel/test-zlib-close-after-write.js
index d159604417c7f8..cbb1ac1fe1f26a 100644
--- a/test/parallel/test-zlib-close-after-write.js
+++ b/test/parallel/test-zlib-close-after-write.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 
diff --git a/test/parallel/test-zlib-convenience-methods.js b/test/parallel/test-zlib-convenience-methods.js
index eb9a2b23c458ca..a32d5d1d4c3f18 100644
--- a/test/parallel/test-zlib-convenience-methods.js
+++ b/test/parallel/test-zlib-convenience-methods.js
@@ -1,6 +1,6 @@
 // test convenience methods with and without options supplied
 
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 
diff --git a/test/parallel/test-zlib-dictionary-fail.js b/test/parallel/test-zlib-dictionary-fail.js
index ad8a95e0b492a5..ea50bf40982d6d 100644
--- a/test/parallel/test-zlib-dictionary-fail.js
+++ b/test/parallel/test-zlib-dictionary-fail.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 
diff --git a/test/parallel/test-zlib-dictionary.js b/test/parallel/test-zlib-dictionary.js
index 8af44823b1352e..3a159e6090126e 100644
--- a/test/parallel/test-zlib-dictionary.js
+++ b/test/parallel/test-zlib-dictionary.js
@@ -1,6 +1,6 @@
 // test compression/decompression with dictionary
 
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 var path = require('path');
diff --git a/test/parallel/test-zlib-flush.js b/test/parallel/test-zlib-flush.js
index 0b189cecddf3f7..cfebda7bd2e5fa 100644
--- a/test/parallel/test-zlib-flush.js
+++ b/test/parallel/test-zlib-flush.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 var path = require('path');
diff --git a/test/parallel/test-zlib-from-gzip.js b/test/parallel/test-zlib-from-gzip.js
index 51a275c9c7a68c..b218b4edfcae69 100644
--- a/test/parallel/test-zlib-from-gzip.js
+++ b/test/parallel/test-zlib-from-gzip.js
@@ -1,7 +1,7 @@
 // test unzipping a file that was created with a non-node gzip lib,
 // piped in as fast as possible.
 
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 var path = require('path');
diff --git a/test/parallel/test-zlib-from-string.js b/test/parallel/test-zlib-from-string.js
index 6382781f0ac936..4ce77a8b528136 100644
--- a/test/parallel/test-zlib-from-string.js
+++ b/test/parallel/test-zlib-from-string.js
@@ -1,6 +1,6 @@
 // test compressing and uncompressing a string with zlib
 
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 
diff --git a/test/parallel/test-zlib-invalid-input.js b/test/parallel/test-zlib-invalid-input.js
index ce5c2d6b0ff130..948ea2244808b2 100644
--- a/test/parallel/test-zlib-invalid-input.js
+++ b/test/parallel/test-zlib-invalid-input.js
@@ -1,6 +1,6 @@
 // test uncompressing invalid input
 
-var common = require('../common.js'),
+var common = require('../common'),
     assert = require('assert'),
     zlib = require('zlib');
 
diff --git a/test/parallel/test-zlib-params.js b/test/parallel/test-zlib-params.js
index 006f1ea8e5cac5..6f1920956159f3 100644
--- a/test/parallel/test-zlib-params.js
+++ b/test/parallel/test-zlib-params.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 var path = require('path');
diff --git a/test/parallel/test-zlib-write-after-close.js b/test/parallel/test-zlib-write-after-close.js
index 5e798a2063859a..54b316631f739d 100644
--- a/test/parallel/test-zlib-write-after-close.js
+++ b/test/parallel/test-zlib-write-after-close.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 
diff --git a/test/parallel/test-zlib.js b/test/parallel/test-zlib.js
index 869567c769243c..bb9ba53d5df2cc 100644
--- a/test/parallel/test-zlib.js
+++ b/test/parallel/test-zlib.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 var path = require('path');
diff --git a/test/pummel/test-stream2-basic.js b/test/pummel/test-stream2-basic.js
index fc0cac04e37812..543acd61c11d67 100644
--- a/test/pummel/test-stream2-basic.js
+++ b/test/pummel/test-stream2-basic.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var R = require('_stream_readable');
 var assert = require('assert');
 
diff --git a/test/sequential/test-regress-GH-3542.js b/test/sequential/test-regress-GH-3542.js
index 5411e1ca71db25..32b3433318855b 100644
--- a/test/sequential/test-regress-GH-3542.js
+++ b/test/sequential/test-regress-GH-3542.js
@@ -3,7 +3,7 @@ if (process.platform !== 'win32') {
   return process.exit(0);
 }
 
-var common = require('../common.js'),
+var common = require('../common'),
     assert = require('assert'),
     fs = require('fs'),
     path = require('path'),
diff --git a/test/sequential/test-regress-GH-3739.js b/test/sequential/test-regress-GH-3739.js
index 709f71220d1ead..d08cfce60226ba 100644
--- a/test/sequential/test-regress-GH-3739.js
+++ b/test/sequential/test-regress-GH-3739.js
@@ -1,4 +1,4 @@
-var common = require('../common.js'),
+var common = require('../common'),
     assert = require('assert'),
     fs = require('fs'),
     path = require('path');
diff --git a/test/sequential/test-stream2-fs.js b/test/sequential/test-stream2-fs.js
index cf9453ed274372..552d686af02314 100644
--- a/test/sequential/test-stream2-fs.js
+++ b/test/sequential/test-stream2-fs.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var R = require('_stream_readable');
 var assert = require('assert');
 
diff --git a/test/sequential/test-stream2-httpclient-response-end.js b/test/sequential/test-stream2-httpclient-response-end.js
index bea0df38737a26..627960888a7fac 100644
--- a/test/sequential/test-stream2-httpclient-response-end.js
+++ b/test/sequential/test-stream2-httpclient-response-end.js
@@ -1,4 +1,4 @@
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var http = require('http');
 var msg = 'Hello';
diff --git a/test/sequential/test-stream2-stderr-sync.js b/test/sequential/test-stream2-stderr-sync.js
index 105eff846caa4b..9b634116db7fa8 100644
--- a/test/sequential/test-stream2-stderr-sync.js
+++ b/test/sequential/test-stream2-stderr-sync.js
@@ -1,6 +1,6 @@
 // Make sure that sync writes to stderr get processed before exiting.
 
-var common = require('../common.js');
+var common = require('../common');
 var assert = require('assert');
 var util = require('util');