diff --git a/common/lib/xmodule/xmodule/modulestore/__init__.py b/common/lib/xmodule/xmodule/modulestore/__init__.py
index 816b512ddd..4cc894f8e6 100644
--- a/common/lib/xmodule/xmodule/modulestore/__init__.py
+++ b/common/lib/xmodule/xmodule/modulestore/__init__.py
@@ -72,7 +72,7 @@ class Location(_LocationBase):
             location = (loc_or_tag, org, course, category, name, revision)
 
         def check_dict(dict_):
-            check_list(dict_.values())
+            check_list(dict_.itervalues())
 
         def check_list(list_):
             for val in list_: