diff --git a/src/util/contracthash.rs b/src/util/contracthash.rs
index 98ad4638..a215ea85 100644
--- a/src/util/contracthash.rs
+++ b/src/util/contracthash.rs
@@ -18,6 +18,8 @@
 //! at http://blockstream.com/sidechains.pdf for details of
 //! what this does.
 
+#![deprecated]
+
 use secp256k1::{self, Secp256k1};
 use PrivateKey;
 use PublicKey;