diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -8,7 +8,7 @@
 from node import hex, nullid, nullrev, short
 from i18n import _
 import os, sys, errno, re, glob, tempfile
-import mdiff, bdiff, util, templater, patch, error, encoding, templatekw
+import util, templater, patch, error, encoding, templatekw
 import match as _match
 import similar