diff --git a/types/chrome/index.d.ts b/types/chrome/index.d.ts
index bc86a897a2..952ae095fb 100644
--- a/types/chrome/index.d.ts
+++ b/types/chrome/index.d.ts
@@ -8450,8 +8450,12 @@ declare namespace chrome.webRequest {
         error: string;
     }
 
-    export interface WebRequestBodyEvent extends chrome.events.Event<(details: WebRequestBodyDetails) => void> {
-        addListener(callback: (details: WebRequestBodyDetails) => void, filter?: RequestFilter, opt_extraInfoSpec?: string[]): void;
+    export interface WebRequestBodyEvent extends chrome.events.Event<(details: WebRequestBodyDetails) => BlockingResponse|void> {
+        addListener(callback: (details: WebRequestBodyDetails) => BlockingResponse|void, filter?: RequestFilter, opt_extraInfoSpec?: string[]): void;
+    }
+
+    export interface WebRequestHeadersSynchronousEvent extends chrome.events.Event<(details: WebRequestHeadersDetails) => BlockingResponse|void> {
+        addListener(callback: (details: WebRequestHeadersDetails) => BlockingResponse|void, filter?: RequestFilter, opt_extraInfoSpec?: string[]): void;
     }
 
     export interface WebRequestHeadersEvent extends chrome.events.Event<(details: WebRequestHeadersDetails) => void> {
@@ -8462,7 +8466,9 @@ declare namespace chrome.webRequest {
         addListener(callback: (details: T) => void, filter?: RequestFilter, opt_extraInfoSpec?: string[]): void;
     }
 
-    export interface WebResponseHeadersEvent extends _WebResponseHeadersEvent<WebResponseHeadersDetails> { }
+    export interface WebResponseHeadersEvent extends chrome.events.Event<(details: WebResponseHeadersDetails) => BlockingResponse|void> {
+        addListener(callback: (details: WebResponseHeadersDetails) => BlockingResponse|void, filter?: RequestFilter, opt_extraInfoSpec?: string[]): void;
+    }
 
     export interface WebResponseCacheEvent extends _WebResponseHeadersEvent<WebResponseCacheDetails> { }
 
@@ -8486,7 +8492,7 @@ declare namespace chrome.webRequest {
     /** Fired when a request is about to occur. */
     export var onBeforeRequest: WebRequestBodyEvent;
     /** Fired before sending an HTTP request, once the request headers are available. This may occur after a TCP connection is made to the server, but before any HTTP data is sent. */
-    export var onBeforeSendHeaders: WebRequestHeadersEvent;
+    export var onBeforeSendHeaders: WebRequestHeadersSynchronousEvent;
     /** Fired just before a request is going to be sent to the server (modifications of previous onBeforeSendHeaders callbacks are visible by the time onSendHeaders is fired). */
     export var onSendHeaders: WebRequestHeadersEvent;
     /** Fired when HTTP response headers of a request have been received. */