diff --git a/browser/devtools/webaudioeditor/test/browser_wa_destroy-node-01.js b/browser/devtools/webaudioeditor/test/browser_wa_destroy-node-01.js
index 28490128c1df..6343cfdce9ae 100644
--- a/browser/devtools/webaudioeditor/test/browser_wa_destroy-node-01.js
+++ b/browser/devtools/webaudioeditor/test/browser_wa_destroy-node-01.js
@@ -40,7 +40,7 @@ function spawnTest() {
   yield Promise.all([destroyed, waitForGraphRendered(panelWin, 3, 2)]);
 
   // Test internal storage
-  ok(panelWin.AudioNodes.length, 3, "All nodes should be GC'd except one gain, osc and dest node.");
+  is(panelWin.AudioNodes.length, 3, "All nodes should be GC'd except one gain, osc and dest node.");
 
   // Test graph rendering
   ok(findGraphNode(panelWin, actorIDs[0]), "dest should be in graph");