diff --git a/angular-signalr-hub/angular-signalr-hub.d.ts b/angular-signalr-hub/angular-signalr-hub.d.ts
index 1edae69c7..302794106 100644
--- a/angular-signalr-hub/angular-signalr-hub.d.ts
+++ b/angular-signalr-hub/angular-signalr-hub.d.ts
@@ -18,7 +18,7 @@ declare module ngSignalr {
         connection: SignalR;
         proxy: HubProxy;
         
-        on(event: string, fn: ((...args: any[]) => void)): void;
+        on(event: string, fn: (...args: any[]) => void): void;
         invoke(method: string, ...args: any[]): JQueryDeferred<any>;
         disconnect(): void;
         connect(): JQueryPromise<any>;
@@ -70,4 +70,4 @@ declare module ngSignalr {
          */
         stateChanged?: (state: SignalRStateChange) => void;
     }
-}
\ No newline at end of file
+}