diff --git a/lib/socket.ts b/lib/socket.ts
index b90af0954..5ac6e726b 100644
--- a/lib/socket.ts
+++ b/lib/socket.ts
@@ -57,7 +57,7 @@ export class Socket<
   public sendBuffer: Array<Packet> = [];
 
   private readonly nsp: string;
-  private readonly auth: object | ((cb: (data: object) => void) => void);
+  public readonly auth: object | ((cb: (data: object) => void) => void);
 
   private ids: number = 0;
   private acks: object = {};