diff --git a/common/lib/xmodule/xmodule/modulestore/__init__.py b/common/lib/xmodule/xmodule/modulestore/__init__.py
index e3502d494f..6fd1d96437 100644
--- a/common/lib/xmodule/xmodule/modulestore/__init__.py
+++ b/common/lib/xmodule/xmodule/modulestore/__init__.py
@@ -602,7 +602,7 @@ class ModuleStoreAssetBase(object):
 
     @contract(
         course_key='CourseKey', asset_type='None | basestring',
-        start='int | None', maxresults='int | None', sort='tuple(str,(int,>=1,<=2))|None'
+        start='int | None', maxresults='int | None', sort='tuple(str,int) | None'
     )
     def get_all_asset_metadata(self, course_key, asset_type, start=0, maxresults=-1, sort=None, **kwargs):
         """