diff --git a/third_party/openthread/platforms/qpg/BUILD.gn b/third_party/openthread/platforms/qpg/BUILD.gn
index 9ced65f3bd956c..b1c2cda1c4a914 100644
--- a/third_party/openthread/platforms/qpg/BUILD.gn
+++ b/third_party/openthread/platforms/qpg/BUILD.gn
@@ -58,7 +58,7 @@ source_set("libopenthread-qpg") {
     "${openthread_qpg_root}/src/${openthread_qpg_family}/misc.c",
     "${openthread_qpg_root}/src/${openthread_qpg_family}/platform.c",
     "${openthread_qpg_root}/src/${openthread_qpg_family}/radio.c",
-    "${openthread_qpg_root}/src/${openthread_qpg_family}/settings.c",
+    "${openthread_qpg_root}/src/${openthread_qpg_family}/settings.cpp",
     "${openthread_qpg_root}/src/${openthread_qpg_family}/uart.c",
   ]