diff --git a/zebra-chain/src/merkle_tree.rs b/zebra-chain/src/merkle_tree.rs
index 85110857f..d791578d9 100644
--- a/zebra-chain/src/merkle_tree.rs
+++ b/zebra-chain/src/merkle_tree.rs
@@ -1,12 +1,8 @@
 //! A binary hash tree of SHA256d (two rounds of SHA256) hashes for
 //! node values.
 
-use std::io;
-
 use sha2::Sha256;
 
-use crate::serialization::{SerializationError, ZcashDeserialize, ZcashSerialize};
-
 /// A binary hash tree of SHA256d (two rounds of SHA256) hashes for
 /// node values.
 #[derive(Default)]