diff --git a/types/phoenix/index.d.ts b/types/phoenix/index.d.ts
index f001afd70c..7fec5e4d58 100644
--- a/types/phoenix/index.d.ts
+++ b/types/phoenix/index.d.ts
@@ -71,10 +71,10 @@ export class Socket {
   log(kind: string, message: string, data: any): void;
   hasLogger(): boolean;
 
-  onOpen(callback: () => void): void;
-  onClose(callback: () => void): void;
-  onError(callback: () => void): void;
-  onMessage(callback: () => void): void;
+  onOpen(callback: (cb: any) => void): void;
+  onClose(callback: (cb: any) => void): void;
+  onError(callback: (cb: any) => void): void;
+  onMessage(callback: (cb: any) => void): void;
 
   makeRef(): string;
 }