diff --git a/ciphers/src/hash_domain.rs b/ciphers/src/hash_domain.rs
index 58a8f46..522806a 100644
--- a/ciphers/src/hash_domain.rs
+++ b/ciphers/src/hash_domain.rs
@@ -134,9 +134,6 @@ impl SecretHashDomain {
             .keyed_hash_to(k.try_into()?, d)
             .to(new_secret_key.secret_mut())?;
         let mut r = SecretHashDomain(new_secret_key, hash_choice);
-        KeyedHash::incorrect_hmac_blake2b()
-            .keyed_hash_to(k.try_into()?, d)
-            .to(r.0.secret_mut())?;
         Ok(r)
     }
 
diff --git a/ciphers/src/lib.rs b/ciphers/src/lib.rs
index d8be6f5..6a584e3 100644
--- a/ciphers/src/lib.rs
+++ b/ciphers/src/lib.rs
@@ -5,8 +5,6 @@ pub mod subtle;
 
 /// All keyed primitives in this crate use 32 byte keys
 pub const KEY_LEN: usize = 32;
-const_assert!(KEY_LEN == Aead::KEY_LEN);
-const_assert!(KEY_LEN == XAead::KEY_LEN);
 const_assert!(KEY_LEN == hash_domain::KEY_LEN);
 
 /// Keyed hashing