diff --git a/hgext/color.py b/hgext/color.py
--- a/hgext/color.py
+++ b/hgext/color.py
@@ -218,12 +218,8 @@ def colordiff(orig, ui, repo, *pats, **o
                  'changed': ['white'],
                  'trailingwhitespace': ['bold', 'red_background']}
 
-_ui = None
-
 def uisetup(ui):
     '''Initialize the extension.'''
-    global _ui
-    _ui = ui
     _setupcmd(ui, 'diff', commands.table, colordiff, _diff_effects)
     _setupcmd(ui, 'incoming', commands.table, None, _diff_effects)
     _setupcmd(ui, 'log', commands.table, None, _diff_effects)
@@ -231,17 +227,10 @@ def uisetup(ui):
     _setupcmd(ui, 'tip', commands.table, None, _diff_effects)
     _setupcmd(ui, 'status', commands.table, colorstatus, _status_effects)
 
-def extsetup():
     try:
         mq = extensions.find('mq')
-        try:
-            # If we are loaded after mq, we must wrap commands.table
-            _setupcmd(_ui, 'qdiff', commands.table, colordiff, _diff_effects)
-            _setupcmd(_ui, 'qseries', commands.table, colorqseries, _patch_effects)
-        except error.UnknownCommand:
-            # Otherwise we wrap mq.cmdtable
-            _setupcmd(_ui, 'qdiff', mq.cmdtable, colordiff, _diff_effects)
-            _setupcmd(_ui, 'qseries', mq.cmdtable, colorqseries, _patch_effects)
+        _setupcmd(ui, 'qdiff', mq.cmdtable, colordiff, _diff_effects)
+        _setupcmd(ui, 'qseries', mq.cmdtable, colorqseries, _patch_effects)
     except KeyError:
         # The mq extension is not enabled
         pass