From 54b01df89c90946d82cb7522f8d155f2c22cf210 Mon Sep 17 00:00:00 2001
From: Jonathan Hui <jonhui@google.com>
Date: Mon, 3 May 2021 22:50:55 -0700
Subject: [PATCH] [router-advertisement] fix implicit conversion loss (#6559)

---
 src/core/border_router/router_advertisement.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/border_router/router_advertisement.hpp b/src/core/border_router/router_advertisement.hpp
index 1ac271e5c..11335f10a 100644
--- a/src/core/border_router/router_advertisement.hpp
+++ b/src/core/border_router/router_advertisement.hpp
@@ -112,7 +112,7 @@ public:
      * @param[in]  aSize  The size of the option in unit of 1 byte.
      *
      */
-    void SetSize(uint16_t aSize) { mLength = (aSize + kLengthUnit - 1) / kLengthUnit; }
+    void SetSize(uint16_t aSize) { mLength = static_cast<uint8_t>((aSize + kLengthUnit - 1) / kLengthUnit); }
 
     /**
      * This method returns the size of the option (in bytes).