diff --git a/p4app/controller.py b/p4app/controller.py
index 2eafaaf..6f083c4 100755
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -529,9 +529,9 @@ class L2Controller(object):
 
 
         id = self.nat64_tcp_session_entry(pkg[IPv6].src,
-                                          pkg[TCP].src_port,
+                                          pkg[TCP].sport,
                                           pkg[IPv6].dst,
-                                          pkg[TCP].dst_port)
+                                          pkg[TCP].dport)
 
 
         # Has already been added? then it's a race condition and
@@ -543,8 +543,8 @@ class L2Controller(object):
 
             # FIXME: Change randomly later, supporting 1:N mappings
             # Keep the same for the moment
-            tcp_src_port = pkg[TCP].src_port
-            tcp_dst_port = pkg[TCP].dst_port
+            tcp_src_port = pkg[TCP].sport
+            tcp_dst_port = pkg[TCP].dport
 
             # FIXME: range, reuse, etc.
             ipv4_src_addr = self.nat64_session_net[self.mode]
@@ -555,9 +555,9 @@ class L2Controller(object):
                                       "nat64_tcp_session_translate",
                                       [
                                           pkg[IPv6].src,
-                                          pkg[TCP].src_port,
+                                          pkg[TCP].sport,
                                           pkg[IPv6].dst,
-                                          pkg[TCP].dst_port
+                                          pkg[TCP].dport
                                       ],
                                       [
                                           ipv4_src_addr,