diff --git a/dm.c b/dm.c
index 5daa0e5..d5b84c8 100644
--- a/dm.c
+++ b/dm.c
@@ -19,6 +19,7 @@
 #define _GNU_SOURCE
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <sys/sysmacros.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <stdarg.h>