diff --git a/CHANGES.md b/CHANGES.md
index a82d0eddc..8ab756100 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -10,12 +10,14 @@
 - `Result` extractor wrapper can now convert error types. [#2581]
 - Associated types in `FromRequest` impl for `Option` and `Result` has changed. [#2581]
 - Maximim number of extractors has changed from 10 to 12. [#2582]
+- Removed bound `<B as MessageBody>::Error: Debug` in test utility functions in order to support returning opaque apps. [#2584]
 
 [#1988]: https://github.com/actix/actix-web/pull/1988
 [#2567]: https://github.com/actix/actix-web/pull/2567
 [#2569]: https://github.com/actix/actix-web/pull/2569
 [#2581]: https://github.com/actix/actix-web/pull/2581
 [#2582]: https://github.com/actix/actix-web/pull/2582
+[#2584]: https://github.com/actix/actix-web/pull/2584
 
 
 ## 4.0.0-beta.19 - 2022-01-04
diff --git a/src/test/test_utils.rs b/src/test/test_utils.rs
index 18317bca5..8207ce270 100644
--- a/src/test/test_utils.rs
+++ b/src/test/test_utils.rs
@@ -471,6 +471,7 @@ mod tests {
     }
 
     #[actix_rt::test]
+    #[allow(dead_code)]
     async fn return_opaque_types() {
         fn test_app() -> App<
             impl ServiceFactory<
@@ -494,9 +495,9 @@ mod tests {
 
         async fn compile_test(mut req: Vec<Request>) {
             let svc = test_service().await;
-            call_service(&svc, req.pop().unwrap());
-            call_and_read_body(&svc, req.pop().unwrap());
-            read_body(call_service(&svc, req.pop().unwrap()).await);
+            call_service(&svc, req.pop().unwrap()).await;
+            call_and_read_body(&svc, req.pop().unwrap()).await;
+            read_body(call_service(&svc, req.pop().unwrap()).await).await;
             let _: String = call_and_read_body_json(&svc, req.pop().unwrap()).await;
             let _: String = read_body_json(call_service(&svc, req.pop().unwrap()).await).await;
         }