diff --git a/chrome/chrome.d.ts b/chrome/chrome.d.ts
index 0095784dc3..a41cfd8436 100755
--- a/chrome/chrome.d.ts
+++ b/chrome/chrome.d.ts
@@ -2364,7 +2364,7 @@ declare module chrome.webRequest {
     }
 
     interface WebRequestAuthRequiredEvent extends chrome.events.Event { 
-        addListener(callback: (details: OnAuthRequiredDetails, callback?: (response: BlockingResponse) => void, filter?: RequestFilter, opt_extraInfoSpec?: string[]) => void): void;
+        addListener(callback: (details: OnAuthRequiredDetails, callback?: (response: BlockingResponse) => void) => void, filter?: RequestFilter, opt_extraInfoSpec?: string[]): void;
         removeListener(callback: (details: OnAuthRequiredDetails, callback?: (response: BlockingResponse) => void) => void): void;
     }