diff --git a/crates/ctap2-proto/src/authenticator/client_pin/mod.rs b/crates/ctap2-proto/src/authenticator/client_pin/mod.rs
index 675fe96..57a3478 100644
--- a/crates/ctap2-proto/src/authenticator/client_pin/mod.rs
+++ b/crates/ctap2-proto/src/authenticator/client_pin/mod.rs
@@ -15,7 +15,6 @@ use raw::{RawRequest, RawResponse};
 
 pub type PinUvAuthParam = [u8; 16];
 
-
 #[derive(Clone, Copy, Debug)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum PinUvAuthToken {
@@ -23,6 +22,15 @@ pub enum PinUvAuthToken {
     Long([u8; 32]),
 }
 
+impl AsRef<[u8]> for PinUvAuthToken {
+    fn as_ref(&self) -> &[u8] {
+        match self {
+            PinUvAuthToken::Short(bytes) => bytes.as_ref(),
+            PinUvAuthToken::Long(bytes) => bytes.as_ref(),
+        }
+    }
+}
+
 #[cfg(feature = "serde")]
 impl TryFrom<&[u8]> for PinUvAuthToken {
     type Error = Error;