diff --git a/titles/wacca/index.py b/titles/wacca/index.py
index 97a3fd4..83264eb 100644
--- a/titles/wacca/index.py
+++ b/titles/wacca/index.py
@@ -98,9 +98,7 @@ class WaccaServlet(BaseServlet):
     async def render_POST(self, request: Request) -> bytes:
         def end(resp: Dict) -> bytes:
             hash = md5(json.dumps(resp, ensure_ascii=False).encode()).digest()
-            j_Resp = Response(json.dumps(resp, ensure_ascii=False))
-            j_Resp.raw_headers.append((b"X-Wacca-Hash", hash.hex().encode()))
-            return j_Resp
+            return Response(content=json.dumps(resp, ensure_ascii=False), headers={"X-Wacca-Hash": hash.hex()})
 
         api = request.path_params.get('api', '')
         branch = request.path_params.get('branch', '')