diff --git a/wmhdplop/devnames.c b/wmhdplop/devnames.c
index b1749aa..5a0b81c 100644
--- a/wmhdplop/devnames.c
+++ b/wmhdplop/devnames.c
@@ -4,6 +4,7 @@
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/sysmacros.h>
 #include <unistd.h>
 #include <linux/major.h>
 #include <ctype.h>