diff --git a/p4app/controller.py b/p4app/controller.py
index 033d773..9bcfd2d 100644
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -158,7 +158,7 @@ class L2Controller(object):
         parser.add_argument('--debug', help='Enable debug logging', action='store_true')
 
         self.args = parser.parse_args()
-        self.mode = args.mode
+        self.mode = self.args.mode
 
 
 if __name__ == "__main__":