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 15:24:54 2014 +0100
@@ -1632,6 +1632,7 @@
     "complex int float index "
     "trunc floor ceil "
     "bool next "
+    "truediv rtruediv"
 )
 
 numerics = "add sub mul div floordiv mod lshift rshift and xor or pow "