1 files changed, 2 insertions, 3 deletions
diff --git a/test/cpp/interop/interop_client.h b/test/cpp/interop/interop_client.h
index 5a085c4c02..7bcb58571e 100644
--- a/test/cpp/interop/interop_client.h
+++ b/test/cpp/interop/interop_client.h
@@ -68,12 +68,11 @@ class InteropClient {
   void DoJwtTokenCreds(const grpc::string& username);
   void DoComputeEngineCreds(const grpc::string& default_service_account,
                             const grpc::string& oauth_scope);
-  // username is a string containing the user email
+  // username the GCE default service account email
   void DoOauth2AuthToken(const grpc::string& username,
                          const grpc::string& oauth_scope);
   // username is a string containing the user email
-  void DoPerRpcCreds(const grpc::string& username,
-                     const grpc::string& oauth_scope);
+  void DoPerRpcCreds(const grpc::string& json_key);
 
  private:
   void PerformLargeUnary(SimpleRequest* request, SimpleResponse* response);