diff --git a/interop-testing/src/main/java/io/grpc/testing/integration/TestServiceClient.java b/interop-testing/src/main/java/io/grpc/testing/integration/TestServiceClient.java
index 2e04c7bc3d..b53a677ec2 100644
--- a/interop-testing/src/main/java/io/grpc/testing/integration/TestServiceClient.java
+++ b/interop-testing/src/main/java/io/grpc/testing/integration/TestServiceClient.java
@@ -619,6 +619,11 @@ public class TestServiceClient {
         return null;
       }
     }
+
+    @Override
+    protected int operationTimeoutMillis() {
+      return 15000;
+    }
   }
 
   private static String validTestCasesHelpText() {