diff --git a/p4app/controller.py b/p4app/controller.py
index 0ea4a9c..2eafaaf 100755
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -343,7 +343,7 @@ class L2Controller(object):
             # Only for matching / if selecting
             self.controller.table_add("nat64_session", "NoAction",
                                       [
-                                          net['v6_net']
+                                          str(net['v6_net'])
                                       ]
             )