diff --git a/pipelines/basic/src/main/resources/include/headers.p4 b/pipelines/basic/src/main/resources/include/headers.p4
index e45c915..1676646 100644
--- a/pipelines/basic/src/main/resources/include/headers.p4
+++ b/pipelines/basic/src/main/resources/include/headers.p4
@@ -22,11 +22,13 @@
 @controller_header("packet_in")
 header packet_in_header_t {
     bit<9> ingress_port;
+    bit<7> _padding;
 }
 
 @controller_header("packet_out")
 header packet_out_header_t {
     bit<9> egress_port;
+    bit<7> _padding;
 }
 
 header ethernet_t {