diff --git a/actix-cors/CHANGES.md b/actix-cors/CHANGES.md
index e62706564..5ad468a63 100644
--- a/actix-cors/CHANGES.md
+++ b/actix-cors/CHANGES.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- `Cors` is now marked `#[must_use]`.
+
 ## 0.6.5
 
 - Fix `Vary` header when Private Network Access is enabled.
diff --git a/actix-cors/src/builder.rs b/actix-cors/src/builder.rs
index a71a9255d..08e0895a0 100644
--- a/actix-cors/src/builder.rs
+++ b/actix-cors/src/builder.rs
@@ -82,6 +82,7 @@ static ALL_METHODS_SET: Lazy<HashSet<Method>> = Lazy::new(|| {
 ///
 /// [Fetch Standard CORS protocol]: https://fetch.spec.whatwg.org/#http-cors-protocol
 #[derive(Debug)]
+#[must_use]
 pub struct Cors {
     inner: Rc<Inner>,
     error: Option<Either<HttpError, CorsError>>,