diff --git a/tests/support/end2end-server.js b/tests/support/end2end-server.js
index 734c966db..b9cb94077 100644
--- a/tests/support/end2end-server.js
+++ b/tests/support/end2end-server.js
@@ -1,4 +1,4 @@
-import task from "./lib/task";
+import task from "./lib/task.js";
 
 function logTask(taskname) {
   return (data) => {