diff --git a/zebra-chain/src/block/merkle.rs b/zebra-chain/src/block/merkle.rs
index 4e6dd9891..9f1ef0d45 100644
--- a/zebra-chain/src/block/merkle.rs
+++ b/zebra-chain/src/block/merkle.rs
@@ -9,7 +9,7 @@ use crate::{
     transaction::{self, Transaction, UnminedTx, UnminedTxId, VerifiedUnminedTx},
 };
 
-#[cfg(any(any(test, feature = "proptest-impl"), feature = "proptest-impl"))]
+#[cfg(any(test, feature = "proptest-impl"))]
 use proptest_derive::Arbitrary;
 
 /// The root of the Bitcoin-inherited transaction Merkle tree, binding the