diff --git a/tacker/auth.py b/tacker/auth.py
index 3c0bbd0a4..f0a4a5257 100644
--- a/tacker/auth.py
+++ b/tacker/auth.py
@@ -72,6 +72,6 @@ def pipeline_factory(loader, global_conf, **local_conf):
     filters = [loader.get_filter(n) for n in pipeline[:-1]]
     app = loader.get_app(pipeline[-1])
     filters.reverse()
-    for filter in filters:
-        app = filter(app)
+    for f in filters:
+        app = f(app)
     return app