diff --git a/common/lib/xmodule/xmodule/split_test_module.py b/common/lib/xmodule/xmodule/split_test_module.py
index 9553e3b898..40a772bcf2 100644
--- a/common/lib/xmodule/xmodule/split_test_module.py
+++ b/common/lib/xmodule/xmodule/split_test_module.py
@@ -159,7 +159,7 @@ class SplitTestModule(SplitTestFields, XModule):
 
             contents.append({
                 'group_id': group_id,
-                'id': child.id,
+                'id': child.location.to_deprecated_string(),
                 'content': rendered_child.content
             })