diff --git a/scripts/gulpfiles/package_tasks.js b/scripts/gulpfiles/package_tasks.js
index 83bf5700bc4..5a215681a8d 100644
--- a/scripts/gulpfiles/package_tasks.js
+++ b/scripts/gulpfiles/package_tasks.js
@@ -321,8 +321,6 @@ function packageLocales() {
   // Remove references to goog.provide and goog.require.
   return gulp.src(`${BUILD_DIR}/msg/js/*.js`)
       .pipe(gulp.replace(/goog\.[^\n]+/g, ''))
-      .pipe(gulp.insert.prepend(`
-      var Blockly = {};Blockly.Msg={};`))
       .pipe(packageUMD('Blockly.Msg', [{
           name: 'Blockly',
           amd: '../core',