diff --git a/actix-http/src/error.rs b/actix-http/src/error.rs
index 2b2d40a6f..c4d663ade 100644
--- a/actix-http/src/error.rs
+++ b/actix-http/src/error.rs
@@ -1066,6 +1066,16 @@ mod tests {
         assert_eq!(resp.status(), StatusCode::OK);
     }
 
+    #[test]
+    fn test_error_casting() {
+        let err = PayloadError::Overflow;
+        let resp_err: &ResponseError = &err;
+        let err = resp_err.downcast_ref::<PayloadError>().unwrap();
+        assert_eq!(err.to_string(), "A payload reached size limit.");
+        let not_err = resp_err.downcast_ref::<ContentTypeError>();
+        assert!(not_err.is_none());
+    }
+
     #[test]
     fn test_error_helpers() {
         let r: Response = ErrorBadRequest("err").into();