diff --git a/types/index.d.ts b/types/index.d.ts
index 709477d..4ba5ba0 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -32,6 +32,7 @@ declare module 'socketio-jwt' {
     callback?: (false | number);
     secret: (string | ((request: any, decodedToken: object, callback: ISocketCallback) => void));
 
+    encodedPropertyName?: string;
     decodedPropertyName?: string;
     auth_header_required?: boolean;
     handshake?: boolean;