diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 2a54f2010f..e10b9beedc 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -364,8 +364,8 @@ class BooleanField(Field):
 
     def to_python(self, value):
         if value in (True, False): return value
-        if value is 't' or value is 'True': return True
-        if value is 'f' or value is 'False': return False
+        if value in ('t', 'True'): return True
+        if value in ('f', 'False'): return False
         raise validators.ValidationError, gettext("This value must be either True or False.")
 
     def get_manipulator_field_objs(self):