diff --git a/builtin_help.hdr b/builtin_help.hdr
index c29325623..7507fae29 100644
--- a/builtin_help.hdr
+++ b/builtin_help.hdr
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <strings.h>
 #include <wchar.h>
+#include <sys/types.h>
 
 #include "config.h"
 #include "util.h"