diff --git a/src/csharp/Grpc.IntegrationTesting/InteropClient.cs b/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
index 888b5c312fef1e922605831b6ce3760270c0a2d8..cb50b44841f0768966d0d801acd09f311f436b5d 100644
--- a/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
+++ b/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
@@ -410,7 +410,7 @@ namespace Grpc.IntegrationTesting
         public static async Task RunPerRpcCredsAsync(TestService.TestServiceClient client, string oauthScope)
         {
             Console.WriteLine("running per_rpc_creds");
-            ITokenAccess googleCredential = (await GoogleCredential.GetApplicationDefaultAsync()).CreateScoped(new[] { oauthScope });
+            ITokenAccess googleCredential = await GoogleCredential.GetApplicationDefaultAsync();
 
             var credentials = GrpcCredentials.Create(googleCredential);
             var request = new SimpleRequest