diff --git a/src/plugins/Timezones/Intl.d.ts b/src/plugins/Timezones/Intl.d.ts
new file mode 100644
index 000000000..6abe9c2d4
--- /dev/null
+++ b/src/plugins/Timezones/Intl.d.ts
@@ -0,0 +1,14 @@
+/*
+ * Vencord, a Discord client mod
+ * Copyright (c) 2024 Vendicated and contributors
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+// As vencord uses 3 decade old typescript I need to have this header file
+// see https://stackoverflow.com/questions/76400750/intl-supportedvaluesof-property-supportedvaluesof-does-not-exist-on-type-type
+// https://github.com/microsoft/TypeScript/issues/49231
+declare namespace Intl {
+    type Key = "calendar" | "collation" | "currency" | "numberingSystem" | "timeZone" | "unit";
+
+    function supportedValuesOf(input: Key): string[];
+}