diff --git a/tools/gce_setup/interop_test_runner.sh b/tools/gce_setup/interop_test_runner.sh
index 430ad09b8c630..7f0b5bab1a91c 100755
--- a/tools/gce_setup/interop_test_runner.sh
+++ b/tools/gce_setup/interop_test_runner.sh
@@ -37,7 +37,7 @@ main() {
source grpc_docker.sh
test_cases=(large_unary empty_unary ping_pong client_streaming server_streaming cancel_after_begin cancel_after_first_response)
clients=(cxx java go ruby node python csharp_mono)
- servers=(cxx java go ruby node python)
+ servers=(cxx java go ruby node python csharp_mono)
for test_case in "${test_cases[@]}"
do
for client in "${clients[@]}"