diff --git a/rest_framework/mixins.py b/rest_framework/mixins.py
index f3695e665..de10d6930 100644
--- a/rest_framework/mixins.py
+++ b/rest_framework/mixins.py
@@ -27,7 +27,7 @@ class CreateModelMixin(object):
 
     def get_success_headers(self, data):
         try:
-            return {'Location': data[api_settings.URL_FIELD_NAME]}
+            return {'Location': str(data[api_settings.URL_FIELD_NAME])}
         except (TypeError, KeyError):
             return {}