diff --git a/test/addons-napi/test_reference/test_reference.c b/test/addons-napi/test_reference/test_reference.c
index 641b1cb82ba..75abc49ad32 100644
--- a/test/addons-napi/test_reference/test_reference.c
+++ b/test/addons-napi/test_reference/test_reference.c
@@ -11,7 +11,7 @@ static napi_value GetFinalizeCount(napi_env env, napi_callback_info info) {
   return result;
 }
 
-void FinalizeExternal(napi_env env, void* data, void* hint) {
+static void FinalizeExternal(napi_env env, void* data, void* hint) {
   int *actual_value = data;
   NAPI_ASSERT_RETURN_VOID(env, actual_value == &test_value,
       "The correct pointer was passed to the finalizer");