diff --git a/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/StreamingDataflowWorker.java b/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/StreamingDataflowWorker.java
index 11849e8b8c4c4..92f7520676ade 100644
--- a/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/StreamingDataflowWorker.java
+++ b/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/StreamingDataflowWorker.java
@@ -631,7 +631,8 @@ public void run() {
                                 + options.getWorkerId()
                                 + "_"
                                 + page.pageName()
-                                + timestamp)
+                                + timestamp
+                                + ".html")
                             .replaceAll("/", "_"));
                 writer = new PrintWriter(outputFile, UTF_8.name());
                 page.captureData(writer);