diff --git a/sys/alpha/alpha/autoconf.c b/sys/alpha/alpha/autoconf.c
index 8fe80ea0f8dc..2e4caca408c9 100644
--- a/sys/alpha/alpha/autoconf.c
+++ b/sys/alpha/alpha/autoconf.c
@@ -29,6 +29,7 @@
 #include "opt_bootp.h"
 #include "opt_ffs.h"
 #include "opt_cd9660.h"
+#include "opt_nfs.h"
 #include "opt_nfsroot.h"
 
 #include <sys/param.h>