diff --git a/tests/bootstrap.js b/tests/bootstrap.js
index 0b27d8606..4dea776aa 100644
--- a/tests/bootstrap.js
+++ b/tests/bootstrap.js
@@ -96,7 +96,7 @@
     // whether Blockly is loaded from compressed or uncompressed.
     // Paths relative to root.
     additionalScripts: [
-      'msg/messages.js',
+      'build/msg/en.js',
     ],
   };
   if (typeof window.BLOCKLY_BOOTSTRAP_OPTIONS === 'object') {
diff --git a/tests/compile/index.html b/tests/compile/index.html
index 97fb52031..0c6ea9988 100644
--- a/tests/compile/index.html
+++ b/tests/compile/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8">
   <title>Blockly: Advanced Compilation Test</title>
   <script src="main_compressed.js"></script>
-  <script src="../../msg/js/en.js"></script>
+  <script src="../../build/msg/en.js"></script>
   <style>
     body {
       background-color: #fff;
diff --git a/tests/generators/index.html b/tests/generators/index.html
index 18455ca70..3b1088677 100644
--- a/tests/generators/index.html
+++ b/tests/generators/index.html
@@ -6,7 +6,7 @@
 <script>
   var BLOCKLY_BOOTSTRAP_OPTIONS = {
     additionalScripts: [
-      'msg/messages.js',
+      'build/msg/en.js',
       'tests/generators/unittest_javascript.js',
       'tests/generators/unittest_python.js',
       'tests/generators/unittest_php.js',
diff --git a/tests/mocha/index.html b/tests/mocha/index.html
index 0c5806244..626f9acb4 100644
--- a/tests/mocha/index.html
+++ b/tests/mocha/index.html
@@ -112,7 +112,7 @@
           'Blockly.test.zoomControls',
         ],
         additionalScripts: [
-          'msg/messages.js',
+          'build/msg/en.js',
           'tests/playgrounds/screenshot.js',
           'node_modules/@blockly/dev-tools/dist/index.js',
         ],
diff --git a/tests/playground.html b/tests/playground.html
index 89f836055..90a727753 100644
--- a/tests/playground.html
+++ b/tests/playground.html
@@ -9,7 +9,7 @@
 <script>
   var BLOCKLY_BOOTSTRAP_OPTIONS = {
     additionalScripts: [
-      'msg/messages.js',
+      'build/msg/en.js',
       'tests/playgrounds/screenshot.js',
       'node_modules/@blockly/dev-tools/dist/index.js',
     ],
diff --git a/tests/playgrounds/advanced_playground.html b/tests/playgrounds/advanced_playground.html
index 2d66c4216..04e0bb7c2 100644
--- a/tests/playgrounds/advanced_playground.html
+++ b/tests/playgrounds/advanced_playground.html
@@ -7,7 +7,7 @@
 <script>
   var BLOCKLY_BOOTSTRAP_OPTIONS = {
     additionalScripts: [
-      'msg/messages.js',
+      'build/msg/en.js',
       'tests/playgrounds/screenshot.js',
       'tests/themes/test_themes.js',
       'node_modules/@blockly/dev-tools/dist/index.js',