diff --git a/lib/make-middleware.js b/lib/make-middleware.js
index ee509886..04b11c2c 100644
--- a/lib/make-middleware.js
+++ b/lib/make-middleware.js
@@ -32,7 +32,7 @@ function makeMiddleware (setup) {
     var appender = null
     var isDone = false
     var readFinished = false
-    var errorOccured = false
+    var errorOccurred = false
     var pendingWrites = new Counter()
     var uploadedFiles = []
 
@@ -70,12 +70,12 @@ function makeMiddleware (setup) {
     }
 
     function indicateDone () {
-      if (readFinished && pendingWrites.isZero() && !errorOccured) done()
+      if (readFinished && pendingWrites.isZero() && !errorOccurred) done()
     }
 
     function abortWithError (uploadError, skipPendingWait) {
-      if (errorOccured) return
-      errorOccured = true
+      if (errorOccurred) return
+      errorOccurred = true
 
       function finishAbort () {
         function remove (file, cb) {
@@ -181,7 +181,7 @@ function makeMiddleware (setup) {
       var placeholder = appender.insertPlaceholder(file)
 
       fileFilter(req, file, function (err, includeFile) {
-        if (errorOccured) {
+        if (errorOccurred) {
           appender.removePlaceholder(placeholder)
           return fileStream.resume()
         }