diff --git a/servers/vfs/Makefile b/servers/vfs/Makefile
index e76b02655..afea3e496 100644
--- a/servers/vfs/Makefile
+++ b/servers/vfs/Makefile
@@ -14,7 +14,7 @@ SRCS+=  gcov.c
 CPPFLAGS+= -DUSE_COVERAGE
 .endif
 
-CFLAGS+= -Wall -Wextra
+CFLAGS+= -Wall -Wextra -Werror
 DPADD+=	${LIBSYS} ${LIBTIMERS} ${LIBEXEC}
 LDADD+=	-lsys -ltimers -lexec -lmthread