diff --git a/dogen/template_helper.py b/dogen/template_helper.py
index 45b8899..4f32ca7 100644
--- a/dogen/template_helper.py
+++ b/dogen/template_helper.py
@@ -10,7 +10,7 @@ def filename(self, source):
         if target:
             return target
 
-        return os.path.basename(source.url)
+        return os.path.basename(source['url'])
 
     def cmd(self, arr):
         """