diff --git a/jedi/api_classes.py b/jedi/api_classes.py
index 66d4db8c..7d88dff6 100644
--- a/jedi/api_classes.py
+++ b/jedi/api_classes.py
@@ -42,6 +42,7 @@ class BaseDefinition(object):
                'macpath': 'os.path',
                'genericpath': 'os.path',
                '_io': 'io',
+               '_functools': 'functools',
                '__builtin__': '',
                'builtins': '',
                }