diff --git a/types/autobahn/index.d.ts b/types/autobahn/index.d.ts
index 969c703478..59bb2c404d 100644
--- a/types/autobahn/index.d.ts
+++ b/types/autobahn/index.d.ts
@@ -25,7 +25,7 @@ declare namespace autobahn {
 
         leave(reason: string, message: string): void;
 
-        call<TResult>(procedure: string, args?: any[], kwargs?: any, options?: ICallOptions): When.Promise<TResult>;
+        call<TResult>(procedure: string, args?: any[] | any, kwargs?: any, options?: ICallOptions): When.Promise<TResult>;
 
         publish(topic: string, args?: any[], kwargs?: any, options?: IPublishOptions): When.Promise<IPublication>;
 
@@ -96,7 +96,7 @@ declare namespace autobahn {
         kwargs: any;
     }
 
-    type SubscribeHandler = (args?: any[], kwargs?: any, details?: IEvent) => void;
+    type SubscribeHandler = (args?: any[] | any, kwargs?: any, details?: IEvent) => void;
 
     interface ISubscription {
         topic: string;
@@ -206,7 +206,7 @@ declare namespace autobahn {
 
     type DeferFactory = () => When.Promise<any>;
 
-    type OnChallengeHandler = (session: Session, method: string, extra: any) => string;
+    type OnChallengeHandler = (session: Session, method: string, extra: any) => string | When.Promise<string>;
 
     interface IConnectionOptions {
         use_es6_promises?: boolean;