1diff --git a/mkcramfs.c b/mkcramfs.c
2index a2ef018959d..bec83c112d1 100644
3--- a/mkcramfs.c
4+++ b/mkcramfs.c
5@@ -22,6 +22,7 @@
6 * If you change the disk format of cramfs, please update fs/cramfs/README.
7 */
8
9+#include <sys/sysmacros.h>
10 #include <sys/types.h>
11 #include <stdio.h>
12 #include <sys/stat.h>