diff --git a/include/grp.h b/include/grp.h
index 5b101cff8a2b..01921f03f5fb 100644
--- a/include/grp.h
+++ b/include/grp.h
@@ -46,6 +46,8 @@
 #define	_PATH_GROUP		"/etc/group"
 #endif
 
+#include <sys/types.h>
+
 struct group {
 	char	*gr_name;		/* group name */
 	char	*gr_passwd;		/* group password */