diff --git a/pandas/core/datetools.py b/pandas/core/datetools.py
index f02939b3fdb0f..0d0e2a098809d 100644
--- a/pandas/core/datetools.py
+++ b/pandas/core/datetools.py
@@ -707,9 +707,9 @@ class Second(Tick):
 
 
 for i, weekday in enumerate(['MON', 'TUE', 'WED', 'THU', 'FRI']):
-    for week in xrange(4):
-        _offsetMap['WOM@%d%s' % (week + 1, weekday)] = \
-            WeekOfMonth(week=week, weekday=i)
+    for iweek in xrange(4):
+        _offsetMap['WOM@%d%s' % (iweek + 1, weekday)] = \
+            WeekOfMonth(week=iweek, weekday=i)
 
 _offsetNames = dict([(v, k) for k, v in _offsetMap.iteritems()])