diff --git a/zebra-chain/src/primitives/proofs.rs b/zebra-chain/src/primitives/proofs.rs
index 50b4b4354..a957743a0 100644
--- a/zebra-chain/src/primitives/proofs.rs
+++ b/zebra-chain/src/primitives/proofs.rs
@@ -16,7 +16,6 @@ pub use self::halo2::Halo2Proof;
 
 /// A marker trait used to abstract over BCTV14, Groth16, or Halo2 proofs.
 pub trait ZkSnarkProof:
-    // Copy +
     Clone
     + Debug
     + PartialEq