diff --git a/src/local_ns_parser.c b/src/local_ns_parser.c
index bd7136c..91937dd 100644
--- a/src/local_ns_parser.c
+++ b/src/local_ns_parser.c
@@ -1,5 +1,6 @@
 #include <errno.h>
 #include <resolv.h>
+#include <stddef.h>
 #include "local_ns_parser.h"
 
 static void local_ns_setsection(ns_msg *msg, ns_sect sect);