diff --git a/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/spi/v1/PollingSubscriberConnection.java b/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/spi/v1/PollingSubscriberConnection.java
index 455bfbd37ba8..3bbf8ed02467 100644
--- a/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/spi/v1/PollingSubscriberConnection.java
+++ b/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/spi/v1/PollingSubscriberConnection.java
@@ -185,6 +185,7 @@ public void run() {
                   TimeUnit.MILLISECONDS);
               return;
             }
+            messageDispatcher.stop();
             notifyFailed(cause);
           }
         });