diff --git a/test/speech_to_text_test.dart b/test/speech_to_text_test.dart
index 213f3f8c..3d1db5a9 100644
--- a/test/speech_to_text_test.dart
+++ b/test/speech_to_text_test.dart
@@ -72,7 +72,7 @@ void main() {
           break;
         case SpeechToText.listenMethod:
           listenInvoked = true;
-          listenLocale = methodCall.arguments;
+          listenLocale = methodCall.arguments["localeId"];
           await speech.processMethodCall(MethodCall(
               SpeechToText.notifyStatusMethod, listeningStatusResponse));
           return initResult;