diff --git a/actix-service/benches/unsafecell_vs_refcell.rs b/actix-service/benches/unsafecell_vs_refcell.rs
index f428829b..8913bf11 100644
--- a/actix-service/benches/unsafecell_vs_refcell.rs
+++ b/actix-service/benches/unsafecell_vs_refcell.rs
@@ -60,7 +60,7 @@ impl Service for SrvRC {
 		Poll::Ready(Ok(()))
 	}
 
-	fn call(&mut self, req: ()) -> Self::Future {
+	fn call(&mut self, _: ()) -> Self::Future {
 		let prev = *self.0.borrow();
 		*(*self.0).borrow_mut() = prev + 1;
 		ok(*self.0.borrow())