diff --git a/nssa/src/public_transaction/witness_set.rs b/nssa/src/public_transaction/witness_set.rs
index f9692068..8222c5ed 100644
--- a/nssa/src/public_transaction/witness_set.rs
+++ b/nssa/src/public_transaction/witness_set.rs
@@ -90,7 +90,7 @@ mod tests {
 
         assert_eq!(witness_set.signatures_and_public_keys.len(), 2);
 
-        let message_bytes = message.to_bytes();
+        let message_bytes = message.hash_message();
         for ((signature, public_key), expected_public_key) in witness_set
             .signatures_and_public_keys
             .into_iter()