diff --git a/GCDWebServer/Core/GCDWebServer.h b/GCDWebServer/Core/GCDWebServer.h
index b68f10c..b4afb4c 100644
--- a/GCDWebServer/Core/GCDWebServer.h
+++ b/GCDWebServer/Core/GCDWebServer.h
@@ -52,7 +52,7 @@ typedef GCDWebServerRequest* (^GCDWebServerMatchBlock)(NSString* requestMethod,
  *  recommended to return a GCDWebServerErrorResponse on error so more useful
  *  information can be returned to the client.
  */
-typedef GCDWebServerResponse* (^GCDWebServerProcessBlock)(GCDWebServerRequest* request);
+typedef GCDWebServerResponse* (^GCDWebServerProcessBlock)(__kindof GCDWebServerRequest* request);
 
 /**
  *  The GCDWebServerAsynchronousProcessBlock works like the GCDWebServerProcessBlock
@@ -65,7 +65,7 @@ typedef GCDWebServerResponse* (^GCDWebServerProcessBlock)(GCDWebServerRequest* r
  *  useful information can be returned to the client.
  */
 typedef void (^GCDWebServerCompletionBlock)(GCDWebServerResponse* response);
-typedef void (^GCDWebServerAsyncProcessBlock)(GCDWebServerRequest* request, GCDWebServerCompletionBlock completionBlock);
+typedef void (^GCDWebServerAsyncProcessBlock)(__kindof GCDWebServerRequest* request, GCDWebServerCompletionBlock completionBlock);
 
 /**
  *  The port used by the GCDWebServer (NSNumber / NSUInteger).