diff --git a/cli/tests/unit/webstorage_test.ts b/cli/tests/unit/webstorage_test.ts
new file mode 100644
index 0000000000..df32e9edb6
--- /dev/null
+++ b/cli/tests/unit/webstorage_test.ts
@@ -0,0 +1,13 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+// deno-lint-ignore-file no-explicit-any
+
+import { assert } from "./test_util.ts";
+
+Deno.test({ permissions: "none" }, function webStoragesReassignable() {
+  // Can reassign to web storages
+  globalThis.localStorage = 1 as any;
+  globalThis.sessionStorage = 1 as any;
+  // The actual values don't change
+  assert(globalThis.localStorage instanceof globalThis.Storage);
+  assert(globalThis.sessionStorage instanceof globalThis.Storage);
+});
diff --git a/runtime/js/99_main.js b/runtime/js/99_main.js
index 9b4a9e8572..c7faefcdda 100644
--- a/runtime/js/99_main.js
+++ b/runtime/js/99_main.js
@@ -587,11 +587,15 @@ delete Intl.v8BreakIterator;
       configurable: true,
       enumerable: true,
       get: webStorage.localStorage,
+      // Makes this reassignable to make astro work
+      set: () => {},
     },
     sessionStorage: {
       configurable: true,
       enumerable: true,
       get: webStorage.sessionStorage,
+      // Makes this reassignable to make astro work
+      set: () => {},
     },
     Storage: util.nonEnumerable(webStorage.Storage),
   };