diff --git a/sys/dev/cxgbe/t4_main.c b/sys/dev/cxgbe/t4_main.c
index 929f31b06dee..e336566d3804 100644
--- a/sys/dev/cxgbe/t4_main.c
+++ b/sys/dev/cxgbe/t4_main.c
@@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
 #include <net/if.h>
 #include <net/if_types.h>
 #include <net/if_dl.h>
+#include <net/if_vlan_var.h>
 
 #include "common/t4_hw.h"
 #include "common/common.h"