diff --git a/include/linux/nfs_idmap.h b/include/linux/nfs_idmap.h
index 15a9f3b7289a..91a1c24e0cbf 100644
--- a/include/linux/nfs_idmap.h
+++ b/include/linux/nfs_idmap.h
@@ -37,6 +37,8 @@
 #ifndef NFS_IDMAP_H
 #define NFS_IDMAP_H
 
+#include <linux/types.h>
+
 /* XXX from bits/utmp.h  */
 #define IDMAP_NAMESZ  128