--- a/devtools/client/animationinspector/test/browser_animation_timeline_header.js
+++ b/devtools/client/animationinspector/test/browser_animation_timeline_header.js
@@ -1,14 +1,16 @@
 /* vim: set ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
  http://creativecommons.org/publicdomain/zero/1.0/ */
 
 "use strict";
 
+requestLongerTimeout(2);
+
 // Check that the timeline shows correct time graduations in the header.
 
 const {findOptimalTimeInterval} = require("devtools/client/animationinspector/utils");
 const {TimeScale} = require("devtools/client/animationinspector/components");
 // Should be kept in sync with TIME_GRADUATION_MIN_SPACING in components.js
 const TIME_GRADUATION_MIN_SPACING = 40;
 
 add_task(function*() {