1 files changed, 1 insertions, 1 deletions
diff --git a/devtools/client/netmonitor/test/browser_net_cached-status.js b/devtools/client/netmonitor/test/browser_net_cached-status.js
index 77346e6842..b41362b398 100644
--- a/devtools/client/netmonitor/test/browser_net_cached-status.js
+++ b/devtools/client/netmonitor/test/browser_net_cached-status.js
@@ -94,7 +94,7 @@ add_task(async function () {
   // that the NS_BINDING_ABORTED status is never displayed for cached requests.
   const observer = {
     QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
-    observe(subject, topic, data) {
+    observe(subject) {
       subject = subject.QueryInterface(Ci.nsIHttpChannel);
       if (subject.URI.spec == STATUS_CODES_SJS + "?sts=ok&cached") {
         subject.cancel(Cr.NS_BINDING_ABORTED);