diff --git a/src/runtime/store/index.ts b/src/runtime/store/index.ts
index 40fda9c666..50699d5f6e 100644
--- a/src/runtime/store/index.ts
+++ b/src/runtime/store/index.ts
@@ -214,7 +214,7 @@ export function derived<T>(stores: Stores, fn: Function, initial_value?: T): Rea
  */
 export function readonly<T>(store: Readable<T>): Readable<T> {
 	return {
-		subscribe: store.subscribe
+		subscribe: store.subscribe.bind(store)
 	};
 }