diff --git a/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/Publisher.java b/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/Publisher.java
index 409c7321288e..4e9ef75439d8 100644
--- a/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/Publisher.java
+++ b/google-cloud-clients/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/Publisher.java
@@ -205,7 +205,7 @@ public String getTopicNameString() {
    *   public void onFailure(Throwable t) {
    *     System.out.println("failed to publish: " + t);
    *   }
-   * });
+   * }, MoreExecutors.directExecutor());
    * }</pre>
    *
    * @param message the message to publish.