diff --git a/ext/web/02_event.js b/ext/web/02_event.js
index dd8b4f57b9..f354bf1828 100644
--- a/ext/web/02_event.js
+++ b/ext/web/02_event.js
@@ -1062,7 +1062,7 @@ class EventTarget {
     // This prevents the recursive dispatches of unload events.
     // See https://github.com/denoland/deno/issues/9201.
     if (event.type === "unload" && self === globalThis_) {
-      globalThis_[SymbolFor("isUnloadDispatched")] = true;
+      globalThis_[SymbolFor("Deno.isUnloadDispatched")] = true;
     }
 
     const { listeners } = self[eventTargetData];
diff --git a/runtime/js/30_os.js b/runtime/js/30_os.js
index 76325cfffe..3af5803ad6 100644
--- a/runtime/js/30_os.js
+++ b/runtime/js/30_os.js
@@ -61,7 +61,7 @@ function exit(code) {
   }
 
   // Dispatches `unload` only when it's not dispatched yet.
-  if (!globalThis[SymbolFor("isUnloadDispatched")]) {
+  if (!globalThis[SymbolFor("Deno.isUnloadDispatched")]) {
     // Invokes the `unload` hooks before exiting
     // ref: https://github.com/denoland/deno/issues/3603
     windowDispatchEvent(new Event("unload"));