diff --git a/viz-core/tests/handler.rs b/viz-core/tests/handler.rs
index 93adf4d..8d48d30 100644
--- a/viz-core/tests/handler.rs
+++ b/viz-core/tests/handler.rs
@@ -235,7 +235,7 @@ async fn handler() -> Result<()> {
         )
         .catch_unwind(|_: Box<dyn std::any::Any + Send>| async move { panic!("Custom Error 2") });
 
-    let resp: Result<Response> = Handler::call(&aa, Request::new(Body::Empty)).await;
+    let resp: Result<Response> = Handler::<Request>::call(&aa, Request::new(Body::Empty)).await;
     assert!(resp.is_ok());
 
     let th = MyAround {