Index: django/db/models/fields/related.py
===================================================================
--- django/db/models/fields/related.py	(revision 7513)
+++ django/db/models/fields/related.py	(working copy)
@@ -165,7 +165,7 @@
     # SingleRelatedObjectDescriptor instance.
     def __init__(self, related):
         self.related = related
-        self.cache_name = '_%s_cache' % related.field.name
+        self.cache_name = '_%s_cache' % related.get_accessor_name()
 
     def __get__(self, instance, instance_type=None):
         if instance is None: