diff --git a/p4app/controller.py b/p4app/controller.py
index e8e9c30..6ee06fe 100644
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -28,7 +28,7 @@ log = logging.getLogger("main")
 class CpuHeader(Packet):
     name = 'CpuPacket'
     fields_desc = [
-        BitField('task',0,8)
+        BitField('task',0,8),
         BitField('ingress_port', 0, 16)
     ]