diff --git a/toolkit/components/osfile/modules/osfile_async_front.jsm b/toolkit/components/osfile/modules/osfile_async_front.jsm
index 33d14219b121..fc00e9c3e839 100644
--- a/toolkit/components/osfile/modules/osfile_async_front.jsm
+++ b/toolkit/components/osfile/modules/osfile_async_front.jsm
@@ -625,7 +625,7 @@ if (SharedAll.Config.DEBUG && Scheduler.launched) {
 const PREF_OSFILE_TEST_SHUTDOWN_OBSERVER =
   "toolkit.osfile.test.shutdown.observer";
 
-AsyncShutdown.webWorkersShutdown.addBlocker(
+AsyncShutdown.xpcomWillShutdown.addBlocker(
   "OS.File: flush pending requests, warn about unclosed files, shut down service.",
   async function() {
     // Give clients a last chance to enqueue requests.