--- a/devtools/client/performance/test/browser_timeline-waterfall-generic.js
+++ b/devtools/client/performance/test/browser_timeline-waterfall-generic.js
@@ -1,16 +1,19 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
 /**
  * Tests if the waterfall is properly built after finishing a recording.
  */
 
 function* spawnTest() {
+  // This test seems to take a long time to cleanup on Ubuntu VMs.
+  requestLongerTimeout(2);
+
   let { target, panel } = yield initPerformance(SIMPLE_URL);
   let { $, $$, EVENTS, PerformanceController, OverviewView, WaterfallView, DetailsView } = panel.panelWin;
   let { WATERFALL_MARKER_SIDEBAR_SAFE_BOUNDS } = require("devtools/client/performance/modules/widgets/marker-view");
 
   yield startRecording(panel);
   ok(true, "Recording has started.");
 
   let updated = 0;