diff --git a/p4app/controller.py b/p4app/controller.py
index 27b7011..268250b 100644
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -258,7 +258,7 @@ class L2Controller(object):
 
         self.args = parser.parse_args()
         self.mode = self.args.mode
-        self.debug = args.debug
+        self.debug = self.args.debug
 
 if __name__ == "__main__":
     import sys