diff --git a/src/vnet/ip/ip4_inlines.h b/src/vnet/ip/ip4_inlines.h
index 3075fbf..00a4712 100644
--- a/src/vnet/ip/ip4_inlines.h
+++ b/src/vnet/ip/ip4_inlines.h
@@ -125,7 +125,7 @@
   if (csum_offload)
     {
       ih->checksum = 0;
-      b->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
+      vnet_buffer_offload_flags_set (b, VNET_BUFFER_OFFLOAD_F_IP_CKSUM);
     }
   else
     ih->checksum = ip4_header_checksum (ih);