diff --git a/src/csharp/Grpc.IntegrationTesting/InteropClient.cs b/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
index c05a5cc6ce74b8e2b0d327419745266ca9eb8277..1fbae374b1d61372f48371b197a81fbbb797280b 100644
--- a/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
+++ b/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
@@ -344,7 +344,7 @@ namespace Grpc.IntegrationTesting
             Assert.AreEqual(PayloadType.COMPRESSABLE, response.Payload.Type);
             Assert.AreEqual(314159, response.Payload.Body.Length);
             Assert.AreEqual(AuthScopeResponse, response.OauthScope);
-            Assert.AreEqual(ServiceAccountUser, response.Username);
+            Assert.AreEqual(ComputeEngineUser, response.Username);
             Console.WriteLine("Passed!");
         }