diff --git a/src/firebase.d.ts b/src/firebase.d.ts
index 907d61b8..26670fd1 100644
--- a/src/firebase.d.ts
+++ b/src/firebase.d.ts
@@ -1228,7 +1228,8 @@ export namespace firebaseFunctions {
     | "europe-west1"
     | "europe-west2"
     | "asia-east2"
-    | "asia-northeast1";
+    | "asia-northeast1"
+    | "australia-southeast1";
 
   export type HttpsCallable<I, O> = (callableData: I) => Promise<O>;