diff --git a/src/php/tests/interop/interop_client.php b/src/php/tests/interop/interop_client.php
index 873fa00b827..6f81bfa6cd5 100755
--- a/src/php/tests/interop/interop_client.php
+++ b/src/php/tests/interop/interop_client.php
@@ -241,6 +241,7 @@ switch($args['test_case']) {
     break;
   case 'cancel_after_first_response':
     cancelAfterFirstResponse($stub);
+    break;
   default:
     exit(1);
 }