diff --git a/api/perf_routes.py b/api/perf_routes.py
index e5bcac2..bbf4a12 100644
--- a/api/perf_routes.py
+++ b/api/perf_routes.py
@@ -1,7 +1,7 @@
 """Frontend performance metrics ingestion endpoint."""
 from __future__ import annotations
 
-from fastapi import APIRouter
+from fastapi import APIRouter, Response
 from pydantic import BaseModel, Field, field_validator
 
 import api.metrics as app_metrics
@@ -26,8 +26,8 @@ class PerfSample(BaseModel):
 perf_router = APIRouter(tags=["perf"])
 
 
-@perf_router.post("/api/perf", status_code=204)
-async def record_perf(samples: list[PerfSample]) -> None:
+@perf_router.post("/api/perf")
+async def record_perf(samples: list[PerfSample]) -> Response:
     if len(samples) > MAX_BATCH_SIZE:
         samples = samples[:MAX_BATCH_SIZE]
 
@@ -41,3 +41,5 @@ async def record_perf(samples: list[PerfSample]) -> None:
             app_metrics.frontend_main_thread.record(s.value, attrs)
         elif s.metric == "feature_count":
             app_metrics.frontend_feature_count.record(s.value)
+
+    return Response(status_code=204)