diff --git a/p4app/controller.py b/p4app/controller.py
index 3a0d711..44d4066 100755
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -306,7 +306,7 @@ class L2Controller(object):
 
         self.controller.table_add("nat46_icmp",
                                   "nat46_icmp_echo_reply",
-                                  [str(v4_dst)
+                                  [str(v4_dst),
                                    str(table_proto['ICMP_ECHO_REPLY'])
                                   ],
                                   [str(v6_src.network_address),
@@ -316,7 +316,7 @@ class L2Controller(object):
 
         self.controller.table_add("nat46_icmp",
                                   "nat46_icmp_echo_request",
-                                  [str(v4_dst)
+                                  [str(v4_dst),
                                    str(table_proto['ICMP_ECHO_REQUEST'])
                                   ],
                                   [str(v6_src.network_address),