diff --git a/google-cloud-spanner-executor/src/main/java/com/google/cloud/executor/spanner/CloudUtil.java b/google-cloud-spanner-executor/src/main/java/com/google/cloud/executor/spanner/CloudUtil.java
index e58d124285c..30a4d98a354 100644
--- a/google-cloud-spanner-executor/src/main/java/com/google/cloud/executor/spanner/CloudUtil.java
+++ b/google-cloud-spanner-executor/src/main/java/com/google/cloud/executor/spanner/CloudUtil.java
@@ -46,7 +46,7 @@ public class CloudUtil {
   // error message causes the trailing headers to exceed this limit.
   private static final int GRPC_MAX_HEADER_LIST_SIZE_BYTES = 10 * 1024 * 1024;
 
-  private static final String TEST_HOST_IN_CERT = "test_cert_2";
+  private static final String TEST_HOST_IN_CERT = "test-cert-2";
 
   public static TransportChannelProvider newChannelProviderHelper(int port) {
     NettyChannelBuilder builder =