1 files changed, 1 insertions, 1 deletions
diff --git a/devtools/shared/heapsnapshot/tests/xpcshell/dominator-tree-worker.js b/devtools/shared/heapsnapshot/tests/xpcshell/dominator-tree-worker.js
index c636226101..1d69c66420 100644
--- a/devtools/shared/heapsnapshot/tests/xpcshell/dominator-tree-worker.js
+++ b/devtools/shared/heapsnapshot/tests/xpcshell/dominator-tree-worker.js
@@ -7,7 +7,7 @@
 
 console.log("Initializing worker.");
 
-self.onmessage = e => {
+self.onmessage = () => {
   console.log("Starting test.");
   try {
     const path = ChromeUtils.saveHeapSnapshot({ runtime: true });