diff --git a/include/linux/net_dropmon.h b/include/linux/net_dropmon.h
index 0217fb8..0e2e100 100644
--- a/include/linux/net_dropmon.h
+++ b/include/linux/net_dropmon.h
@@ -1,6 +1,7 @@
 #ifndef __NET_DROPMON_H
 #define __NET_DROPMON_H
 
+#include <linux/types.h>
 #include <linux/netlink.h>
 
 struct net_dm_drop_point {