diff --git a/BUILD.gn b/BUILD.gn
index 9d48779..512bfc4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -33,6 +33,7 @@
     "-Wno-deprecated-copy",
     "-Wno-implicit-fallthrough",
     "-Wno-extra-semi",
+    "-Wno-unused-but-set-variable",
   ]
   defines = []
   if (openthread_config_file != "") {