diff --git a/django/db/models/fields/generic.py b/django/db/models/fields/generic.py
index 5f4de40e69..7d7651029c 100644
--- a/django/db/models/fields/generic.py
+++ b/django/db/models/fields/generic.py
@@ -117,7 +117,7 @@ class GenericRelation(RelatedField, Field):
         return self.object_id_field_name
         
     def m2m_reverse_name(self):
-        return self.model._meta.pk.attname
+        return self.object_id_field_name
 
     def contribute_to_class(self, cls, name):
         super(GenericRelation, self).contribute_to_class(cls, name)