diff --git a/cms/static/js/certificates/models/signatory.js b/cms/static/js/certificates/models/signatory.js
index da07ed2a90..445743cfc5 100644
--- a/cms/static/js/certificates/models/signatory.js
+++ b/cms/static/js/certificates/models/signatory.js
@@ -3,8 +3,7 @@
 define([ // jshint ignore:line
     'underscore',
     'backbone',
-    'backbone-relational',
-    'underscore.string'
+    'backbone-relational'
 ],
 function(_, Backbone) {
     'use strict';
diff --git a/lms/envs/common.py b/lms/envs/common.py
index 7365b09e8b..17d91e309f 100644
--- a/lms/envs/common.py
+++ b/lms/envs/common.py
@@ -1248,7 +1248,7 @@ base_vendor_js = [
     'js/vendor/jquery.cookie.js',
     'js/vendor/url.min.js',
     'common/js/vendor/underscore.js',
-    'js/vendor/underscore.string.min.js',
+    'common/js/vendor/underscore.string.js',
 
     # Make some edX UI Toolkit utilities available in the global "edx" namespace
     'edx-ui-toolkit/js/utils/global-loader.js',