diff --git a/include/linux/raid/md_p.h b/include/linux/raid/md_p.h
index 9491026afe66..6ba830fa8538 100644
--- a/include/linux/raid/md_p.h
+++ b/include/linux/raid/md_p.h
@@ -15,6 +15,8 @@
 #ifndef _MD_P_H
 #define _MD_P_H
 
+#include <linux/types.h>
+
 /*
  * RAID superblock.
  *