From 6aa730969a811f2a5cafa3a89f4027d70530ee29 Mon Sep 17 00:00:00 2001
From: Jonathan Hui <jonhui@google.com>
Date: Tue, 16 Nov 2021 12:24:54 -0800
Subject: [PATCH] [heap] include `stddef.h` for `size_t` (#7172)

---
 src/core/common/heap.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/core/common/heap.hpp b/src/core/common/heap.hpp
index 87011402f..529f6f2b9 100644
--- a/src/core/common/heap.hpp
+++ b/src/core/common/heap.hpp
@@ -36,6 +36,7 @@
 
 #include "openthread-core-config.h"
 
+#include <stddef.h>
 #include <string.h>
 
 namespace ot {