diff -r f8dbec87dbfe Lib/unittest/mock.py
--- a/Lib/unittest/mock.py	Tue Mar 18 07:44:07 2014 +0100
+++ b/Lib/unittest/mock.py	Tue Mar 18 15:35:27 2014 +0100
@@ -1634,7 +1634,9 @@
     "bool next "
 )
 
-numerics = "add sub mul div floordiv mod lshift rshift and xor or pow "
+numerics = (
+    "add sub mul div floordiv mod lshift rshift and xor or pow truediv"
+)
 inplace = ' '.join('i%s' % n for n in numerics.split())
 right = ' '.join('r%s' % n for n in numerics.split())