diff --git a/sys/dev/mwl/if_mwl.c b/sys/dev/mwl/if_mwl.c
index f54320564c28..2a1ede5e8319 100644
--- a/sys/dev/mwl/if_mwl.c
+++ b/sys/dev/mwl/if_mwl.c
@@ -37,6 +37,7 @@ __FBSDID("$FreeBSD$");
 
 #include "opt_inet.h"
 #include "opt_mwl.h"
+#include "opt_wlan.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>