diff --git a/cms/lib/xblock/authoring_mixin.py b/cms/lib/xblock/authoring_mixin.py
index b9057391b1..3551059cd0 100644
--- a/cms/lib/xblock/authoring_mixin.py
+++ b/cms/lib/xblock/authoring_mixin.py
@@ -43,7 +43,7 @@ class AuthoringMixin(XBlockMixin):
             'xblock': self,
             'manage_groups_url': reverse_course_url('group_configurations_list_handler', self.location.course_key),
         }))
-        fragment.add_javascript_url(self._get_studio_resource_url('/js/xblock/authoring.js'))
+        fragment.add_javascript_url(self._get_studio_resource_url('js/xblock/authoring.js'))
         fragment.initialize_js('VisibilityEditorInit')
         return fragment
 
diff --git a/cms/lib/xblock/tagging/tagging.py b/cms/lib/xblock/tagging/tagging.py
index 80f7cc0f28..38eef0e788 100644
--- a/cms/lib/xblock/tagging/tagging.py
+++ b/cms/lib/xblock/tagging/tagging.py
@@ -66,7 +66,7 @@ class StructuredTagsAside(XBlockAside):
             fragment = Fragment(render_to_string('structured_tags_block.html', {'tags': tags,
                                                                                 'tags_count': len(tags),
                                                                                 'block_location': block.location}))
-            fragment.add_javascript_url(self._get_studio_resource_url('/js/xblock_asides/structured_tags.js'))
+            fragment.add_javascript_url(self._get_studio_resource_url('js/xblock_asides/structured_tags.js'))
             fragment.initialize_js('StructuredTagsInit')
             return fragment
         else: