diff --git a/ruma-client-api/src/lib.rs b/ruma-client-api/src/lib.rs
index 22b5a1c0..3e85504f 100644
--- a/ruma-client-api/src/lib.rs
+++ b/ruma-client-api/src/lib.rs
@@ -2,7 +2,7 @@
 //! endpoint in the [Matrix](https://matrix.org/) client API specification. These types can be
 //! shared by client and server code.
 
-#![deny(missing_copy_implementations, missing_debug_implementations, missing_docs)]
+#![warn(missing_copy_implementations, missing_debug_implementations, missing_docs)]
 #![allow(clippy::new_without_default)]
 
 pub mod error;