diff --git a/src/handler.rs b/src/handler.rs
index 8957cb9..ce3d1dd 100644
--- a/src/handler.rs
+++ b/src/handler.rs
@@ -31,7 +31,7 @@ where
         }
     }
 
-    #[async_recursion(?Send)]
+    #[async_recursion]
     pub async fn perform(
         &self,
         req: Request<hyper::Body>,