diff --git a/sys/modules/Makefile b/sys/modules/Makefile
index 30ce1894dd1..ce56c6e5e75 100644
--- a/sys/modules/Makefile
+++ b/sys/modules/Makefile
@@ -30,6 +30,7 @@ SUBDIR=	3dfx \
 	if_disc \
 	if_ef \
 	if_gif \
+	if_gre \
 	if_faith \
 	if_ppp \
 	if_sl \