diff --git a/zebra-chain/src/orchard/sinsemilla.rs b/zebra-chain/src/orchard/sinsemilla.rs
index 04cbd97a4..ee5f27fa1 100644
--- a/zebra-chain/src/orchard/sinsemilla.rs
+++ b/zebra-chain/src/orchard/sinsemilla.rs
@@ -128,7 +128,7 @@ pub fn sinsemilla_hash(D: &[u8], M: &BitVec<Lsb0, u8>) -> pallas::Base {
 #[allow(non_snake_case)]
 pub fn sinsemilla_commit(r: pallas::Scalar, D: &[u8], M: &BitVec<Lsb0, u8>) -> pallas::Point {
     sinsemilla_hash_to_point(&[D, b"-M"].concat(), M)
-        + pallas_group_hash(&[D, b"r"].concat(), b"") * r
+        + pallas_group_hash(&[D, b"-r"].concat(), b"") * r
 }
 
 /// SinsemillaShortCommit_r(D, M) := Extract_P(SinsemillaCommit_r(D, M))