diff --git a/hgext/convert/cvs.py b/hgext/convert/cvs.py
--- a/hgext/convert/cvs.py
+++ b/hgext/convert/cvs.py
@@ -250,7 +250,7 @@ class convert_cvs(converter_source):
         files = self.files[rev]
         cl = files.items()
         cl.sort()
-        return cl
+        return (cl, {})
 
     def getcommit(self, rev):
         return self.changeset[rev]