diff --git a/split_cl.py b/split_cl.py
index 2edea27ff..b4c508272 100644
--- a/split_cl.py
+++ b/split_cl.py
@@ -340,7 +340,7 @@ def SplitCl(description_file, comment_file, changelist, cmd_upload, dry_run,
     EnsureInGitRepository()
 
     cl = changelist()
-    change = cl.GetChange(cl.GetCommonAncestorWithUpstream(), None)
+    change = cl.GetChange(cl.GetCommonAncestorWithUpstream())
     files = change.AffectedFiles()
 
     if not files: