diff --git a/slowapi/middleware.py b/slowapi/middleware.py
index 68737ee..26fc00f 100644
--- a/slowapi/middleware.py
+++ b/slowapi/middleware.py
@@ -52,6 +52,8 @@ class SlowAPIMiddleware(BaseHTTPMiddleware):
             # request.state._rate_limiting_complete = True
             response = await call_next(request)
             if limiter.enabled:
-                response = limiter._inject_headers(response, request.state.view_rate_limit)
+                response = limiter._inject_headers(
+                    response, request.state.view_rate_limit
+                )
             return response
         return await call_next(request)