diff --git a/test/cpp/interop/client.cc b/test/cpp/interop/client.cc
index cb5232153bb69d5c5e61a6d03faf0f18b46c630c..20fe1c515ff9b61c88a9122c917e1f677528517f 100644
--- a/test/cpp/interop/client.cc
+++ b/test/cpp/interop/client.cc
@@ -68,7 +68,6 @@ DEFINE_string(test_case, "large_unary",
               "cancel_after_begin : cancel stream after starting it; "
               "cancel_after_first_response: cancel on first response; "
               "timeout_on_sleeping_server: deadline exceeds on stream; "
-              "service_account_creds : large_unary with service_account auth; "
               "compute_engine_creds: large_unary with compute engine auth; "
               "jwt_token_creds: large_unary with JWT token auth; "
               "oauth2_auth_token: raw oauth2 access token auth; "
@@ -114,9 +113,6 @@ int main(int argc, char** argv) {
     client.DoCancelAfterFirstResponse();
   } else if (FLAGS_test_case == "timeout_on_sleeping_server") {
     client.DoTimeoutOnSleepingServer();
-  } else if (FLAGS_test_case == "service_account_creds") {
-    grpc::string json_key = GetServiceAccountJsonKey();
-    client.DoServiceAccountCreds(json_key, FLAGS_oauth_scope);
   } else if (FLAGS_test_case == "compute_engine_creds") {
     client.DoComputeEngineCreds(FLAGS_default_service_account,
                                 FLAGS_oauth_scope);
@@ -146,7 +142,6 @@ int main(int argc, char** argv) {
     // service_account_creds and jwt_token_creds can only run with ssl.
     if (FLAGS_enable_ssl) {
       grpc::string json_key = GetServiceAccountJsonKey();
-      client.DoServiceAccountCreds(json_key, FLAGS_oauth_scope);
       client.DoJwtTokenCreds(json_key);
       client.DoOauth2AuthToken(json_key, FLAGS_oauth_scope);
       client.DoPerRpcCreds(json_key, FLAGS_oauth_scope);
@@ -159,8 +154,7 @@ int main(int argc, char** argv) {
         "large_unary|large_compressed_unary|client_streaming|server_streaming|"
         "server_compressed_streaming|half_duplex|ping_pong|cancel_after_begin|"
         "cancel_after_first_response|timeout_on_sleeping_server|"
-        "service_account_creds|compute_engine_creds|jwt_token_creds|"
-        "oauth2_auth_token|per_rpc_creds",
+        "compute_engine_creds|jwt_token_creds|oauth2_auth_token|per_rpc_creds",
         FLAGS_test_case.c_str());
     ret = 1;
   }