# must fail: head_proof_ok_O3 fetch_O3_low
# the content hash loses its domain (jwp_hash::content_hash)
diff --git a/wai/wai-rs/src/jwp_hash.rs b/wai/wai-rs/src/jwp_hash.rs
index d20bc358..f773f1fd 100644
--- a/wai/wai-rs/src/jwp_hash.rs
+++ b/wai/wai-rs/src/jwp_hash.rs
@@ -13,7 +13,6 @@ pub const DOMAIN_OBJECT: &[u8] = b"moq-jwp:object\x01";
 /// followed by the envelope bytes.
 pub fn content_hash(envelope_bytes: &[u8]) -> [u8; 32] {
     let mut h = blake3::Hasher::new();
-    h.update(DOMAIN_OBJECT);
     h.update(envelope_bytes);
     *h.finalize().as_bytes()
 }