diff --git a/include/linux/pps.h b/include/linux/pps.h
index cfe5c72..0194ab0 100644
--- a/include/linux/pps.h
+++ b/include/linux/pps.h
@@ -22,6 +22,8 @@
 #ifndef _PPS_H_
 #define _PPS_H_
 
+#include <linux/types.h>
+
 #define PPS_VERSION		"5.3.6"
 #define PPS_MAX_SOURCES		16		/* should be enough... */