diff --git a/.travis.yml b/.travis.yml
index 6d12680a1..4592b095c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -46,7 +46,6 @@ matrix:
       firefox: latest
     env:
     - TEST_COMMAND="xvfb-run npm run test:integration"
-    - SKIP_REMOTE_BROWSERS=true
 
   - node_js: '9'
     addons:
@@ -55,3 +54,4 @@ matrix:
       sauce_connect: true
     env:
     - TEST_COMMAND="xvfb-run npm run test:integration"
+    - WCT_SAUCE=true
diff --git a/packages/esm-amd-loader/test/package.json b/packages/esm-amd-loader/test/package.json
index db2c1cf4f..2990f0390 100644
--- a/packages/esm-amd-loader/test/package.json
+++ b/packages/esm-amd-loader/test/package.json
@@ -7,7 +7,7 @@
     "clean": "rm -rf lib/",
     "lint": "tslint --project . --format stylish",
     "build": "npm run clean && tsc",
-    "test:wct": "npm run lint && npm run build && wct"
+    "test:wct": "npm run lint && npm run build && bash run-wct.sh"
   },
   "devDependencies": {
     "@polymer/esm-amd-loader": "^1.0.0",
diff --git a/packages/esm-amd-loader/test/run-wct.sh b/packages/esm-amd-loader/test/run-wct.sh
new file mode 100755
index 000000000..5be20925a
--- /dev/null
+++ b/packages/esm-amd-loader/test/run-wct.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+if [ -n "$WCT_SAUCE" ]; then
+  npx wct --plugin local --plugin sauce
+else
+  npx wct --plugin local
+fi
diff --git a/packages/esm-amd-loader/test/wct.conf.json b/packages/esm-amd-loader/test/wct.conf.json
index 03117ef55..44c163e5b 100644
--- a/packages/esm-amd-loader/test/wct.conf.json
+++ b/packages/esm-amd-loader/test/wct.conf.json
@@ -3,5 +3,31 @@
   "moduleResolution": "node",
   "suites": [
     "static/**/*.html"
-  ]
+  ],
+  "plugins": {
+    "local": {
+      "disabled": false,
+      "browsers": ["all"]
+    },
+    "sauce": {
+      "disabled": true,
+      "browsers": [
+        {
+          "browserName": "internet explorer",
+          "platform": "Windows 8.1",
+          "version": "11"
+        },
+        {
+          "browserName": "microsoftedge",
+          "platform": "Windows 10",
+          "version": "latest"
+        },
+        {
+          "browserName": "safari",
+          "platform": "OS X 10.13",
+          "version": "latest"
+        }
+      ]
+    }
+  }
 }
diff --git a/packages/web-component-tester/test/integration/browser.ts b/packages/web-component-tester/test/integration/browser.ts
index f4d11fae4..d8fc75c83 100644
--- a/packages/web-component-tester/test/integration/browser.ts
+++ b/packages/web-component-tester/test/integration/browser.ts
@@ -49,8 +49,12 @@ function loadOptionsFile(dir: string): config.Config {
 
 const testLocalBrowsers = !process.env.SKIP_LOCAL_BROWSERS;
 const testLocalBrowsersList = parseList(process.env.TEST_LOCAL_BROWSERS);
-const testRemoteBrowsers = !process.env.SKIP_REMOTE_BROWSERS &&
-    process.env.SAUCE_USERNAME && process.env.SAUCE_ACCESS_KEY;
+const testRemoteBrowsers = process.env.WCT_SAUCE;
+if (testRemoteBrowsers &&
+    !(process.env.SAUCE_USERNAME && process.env.SAUCE_ACCESS_KEY)) {
+  throw new Error(
+      'Must set SAUCE_USERNAME and SAUCE_ACCESS_KEY when WCT_SAUCE is set.');
+}
 const testRemoteBrowsersList = parseList(process.env.TEST_REMOTE_BROWSERS);
 if (testRemoteBrowsersList.length === 0) {
   testRemoteBrowsersList.push('default');