diff --git a/halo2_gadgets/src/sinsemilla/chip/hash_to_point.rs b/halo2_gadgets/src/sinsemilla/chip/hash_to_point.rs
index cda643417..8e09a572e 100644
--- a/halo2_gadgets/src/sinsemilla/chip/hash_to_point.rs
+++ b/halo2_gadgets/src/sinsemilla/chip/hash_to_point.rs
@@ -18,9 +18,12 @@ use pasta_curves::{arithmetic::CurveAffine, pallas};
 use std::ops::Deref;
 
 /// `EccPointQ` can hold either a public or a private ECC Point
+/// (this structure is only used in tests)
 #[derive(Debug, Clone)]
 pub enum EccPointQ<'a> {
+    #[allow(dead_code)]
     PublicPoint(pallas::Affine),
+    #[allow(dead_code)]
     PrivatePoint(&'a NonIdentityEccPoint),
 }
 
diff --git a/halo2_gadgets/src/sinsemilla/primitives.rs b/halo2_gadgets/src/sinsemilla/primitives.rs
index 215c09ff9..4721b66a2 100644
--- a/halo2_gadgets/src/sinsemilla/primitives.rs
+++ b/halo2_gadgets/src/sinsemilla/primitives.rs
@@ -347,7 +347,7 @@ mod tests {
 
         let domain = CommitDomain::new("z.cash:ZSA-NoteCommit");
 
-        let mut os_rng = OsRng::default();
+        let mut os_rng = OsRng;
         let msg: Vec<bool> = (0..36).map(|_| os_rng.gen::<bool>()).collect();
 
         let rcm = pallas::Scalar::random(&mut os_rng);