diff --git a/sys/modules/umapfs/Makefile b/sys/modules/umapfs/Makefile
index 28acc62ee646..c12ff6207654 100644
--- a/sys/modules/umapfs/Makefile
+++ b/sys/modules/umapfs/Makefile
@@ -2,9 +2,12 @@
 
 .PATH:	${.CURDIR}/../../miscfs/umapfs
 KMOD=	umap
-SRCS=	umap_subr.c umap_vfsops.c umap_vnops.c
+SRCS=	opt_ddb.h umap_subr.c umap_vfsops.c umap_vnops.c
 NOMAN=
-VFS_KLD= yes
-CFLAGS+= -DUMAPFS
+VFS_KLD=
+CLEANFILES= opt_ddb.h
+
+opt_ddb.h:
+	touch ${.TARGET}
 
 .include <bsd.kmod.mk>