diff --git a/crates/ctap2-proto/src/lib.rs b/crates/ctap2-proto/src/lib.rs
index 0d4a169..7cbed44 100644
--- a/crates/ctap2-proto/src/lib.rs
+++ b/crates/ctap2-proto/src/lib.rs
@@ -1,4 +1,4 @@
-#![feature(cfg_eval)]
+#![feature(cfg_eval, adt_const_params)]
 
 pub mod prelude {
     pub use crate::{