diff --git a/src/ed25519.rs b/src/ed25519.rs
index 1a79a11..0654eb1 100644
--- a/src/ed25519.rs
+++ b/src/ed25519.rs
@@ -183,12 +183,6 @@ impl Drop for SecretKey {
     }
 }
 
-impl AsRef<[u8]> for SecretKey {
-    fn as_ref(&self) -> &[u8] {
-        self.as_bytes()
-    }
-}
-
 impl SecretKey {
     /// Expand this `SecretKey` into an `ExpandedSecretKey`.
     pub fn expand<D>(&self) -> ExpandedSecretKey
@@ -721,12 +715,6 @@ impl Debug for PublicKey {
     }
 }
 
-impl AsRef<[u8]> for PublicKey {
-    fn as_ref(&self) -> &[u8] {
-        self.as_bytes()
-    }
-}
-
 impl PublicKey {
     /// Convert this public key to a byte array.
     #[inline]