diff --git a/src/lib.rs b/src/lib.rs
index 9a092b526..69f945bb5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -198,21 +198,6 @@ pub trait ThirtyTwoByteHash {
     fn into_32(self) -> [u8; 32];
 }
 
-#[cfg(feature = "hashes")]
-impl ThirtyTwoByteHash for hashes::sha256::Hash {
-    fn into_32(self) -> [u8; 32] { self.to_byte_array() }
-}
-
-#[cfg(feature = "hashes")]
-impl ThirtyTwoByteHash for hashes::sha256d::Hash {
-    fn into_32(self) -> [u8; 32] { self.to_byte_array() }
-}
-
-#[cfg(feature = "hashes")]
-impl<T: hashes::sha256t::Tag> ThirtyTwoByteHash for hashes::sha256t::Hash<T> {
-    fn into_32(self) -> [u8; 32] { self.to_byte_array() }
-}
-
 /// A (hashed) message input to an ECDSA signature.
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Message([u8; constants::MESSAGE_SIZE]);