diff --git a/django/db/models/base.py b/django/db/models/base.py
index 70420300e4..659c67c0d3 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -457,7 +457,7 @@ class Model(object):
 
     def _get_FIELD_filename(self, field):
         if getattr(self, field.attname): # value is not blank
-            return os.path.join(settings.MEDIA_ROOT, getattr(self, field.attname))
+            return os.path.normpath(os.path.join(settings.MEDIA_ROOT, getattr(self, field.attname)))
         return ''
 
     def _get_FIELD_url(self, field):