diff --git a/core/controllers/base_test.py b/core/controllers/base_test.py
index 440b3f44ebb1..515c537440af 100644
--- a/core/controllers/base_test.py
+++ b/core/controllers/base_test.py
@@ -74,13 +74,15 @@ def test_dev_indicator_appears_in_dev_and_not_in_production(self):
 
         with self.swap(constants, 'DEV_MODE', True):
             response = self.get_html_response(feconf.LIBRARY_INDEX_URL)
-            self.assertIn('<div ng-if="DEV_MODE" class="oppia-dev-mode">',
-                          response.body)
+            self.assertIn(
+                '<div ng-if="DEV_MODE" class="oppia-dev-mode" ng-cloak>',
+                response.body)
 
         with self.swap(constants, 'DEV_MODE', False):
             response = self.get_html_response(feconf.LIBRARY_INDEX_URL)
-            self.assertIn('<div ng-if="DEV_MODE" class="oppia-dev-mode">',
-                          response.body)
+            self.assertIn(
+                '<div ng-if="DEV_MODE" class="oppia-dev-mode" ng-cloak>',
+                response.body)
 
     def test_that_no_get_results_in_500_error(self):
         """Test that no GET request results in a 500 error."""
diff --git a/core/templates/dev/head/pages/base.html b/core/templates/dev/head/pages/base.html
index 0b7fca12f570..61f59b051c1e 100755
--- a/core/templates/dev/head/pages/base.html
+++ b/core/templates/dev/head/pages/base.html
@@ -155,7 +155,7 @@ <h2>
         </div>
       </div>
 
-      <div ng-if="DEV_MODE" class="oppia-dev-mode">
+      <div ng-if="DEV_MODE" class="oppia-dev-mode" ng-cloak>
         Dev Mode
       </div>
 
diff --git a/core/tests/build_sources/templates/base.html b/core/tests/build_sources/templates/base.html
index b3ae8d1a40bb..78cd155047a4 100755
--- a/core/tests/build_sources/templates/base.html
+++ b/core/tests/build_sources/templates/base.html
@@ -160,7 +160,7 @@ <h2>
         </div>
       </div>
 
-      <div ng-if="DEV_MODE" class="oppia-dev-mode">
+      <div ng-if="DEV_MODE" class="oppia-dev-mode" ng-cloak>
         Dev Mode
       </div>