diff --git a/types/actioncable/index.d.ts b/types/actioncable/index.d.ts
index d0e2216e73..91448be865 100644
--- a/types/actioncable/index.d.ts
+++ b/types/actioncable/index.d.ts
@@ -28,7 +28,7 @@ declare module ActionCable {
     connected?(): void;
     disconnected?(): void;
     received?(obj: any): void;
-    [key: string]: Function;
+    [key: string]: any;
   }
 
   interface ChannelNameWithParams {