diff --git a/core/templates/dev/head/services/IdGenerationService.js b/core/templates/dev/head/services/IdGenerationService.js
index 4a7a802264fa..e6544b171906 100644
--- a/core/templates/dev/head/services/IdGenerationService.js
+++ b/core/templates/dev/head/services/IdGenerationService.js
@@ -21,7 +21,11 @@ oppia.factory('IdGenerationService', [function() {
     generateNewId: function() {
       // Generates random string using the last 10 digits of
       // the string for better entropy.
-      return Math.random().toString(36).slice(2).slice(-10);
+      var randomString = Math.random().toString(36).slice(2);
+      while (randomString.length < 10) {
+        randomString = randomString + '0';
+      }
+      return randomString.slice(-10);
     }
   };
 }]);