diff --git a/library/server/ewsgi/specification/wgi_service.e b/library/server/ewsgi/specification/wgi_service.e
index 89a4b414..cfd30540 100644
--- a/library/server/ewsgi/specification/wgi_service.e
+++ b/library/server/ewsgi/specification/wgi_service.e
@@ -10,7 +10,7 @@ deferred class
 
 feature {NONE} -- Execution
 
-	execute (req: WGI_REQUEST; res: WGI_RESPONSE_BUFFER)
+	execute (req: WGI_REQUEST; res: WGI_RESPONSE)
 			-- Execute the request
 			-- See `req.input' for input stream
 			--     `req.environment' for the Gateway environment