diff --git a/zebra-chain/src/block/header.rs b/zebra-chain/src/block/header.rs
index 7f5edbdb..2e87db34 100644
--- a/zebra-chain/src/block/header.rs
+++ b/zebra-chain/src/block/header.rs
@@ -1,7 +1,6 @@
 use super::{difficulty::CompactDifficulty, BlockHeaderHash, Error};
 use crate::equihash_solution::EquihashSolution;
 use crate::merkle_tree::MerkleTreeRootHash;
-use crate::note_commitment_tree::SaplingNoteTreeRootHash;
 use crate::serialization::ZcashSerialize;
 use chrono::{DateTime, Duration, Utc};
 
@@ -47,7 +46,7 @@ pub struct BlockHeader {
     //   - replace with an unspecified HistoryRootHash type?
     // Note that the NetworkUpgrade list is in zebra-consensus, so we can't
     // parse this field into a HistoryRootHash enum in zebra-chain.
-    pub final_sapling_root_hash: SaplingNoteTreeRootHash,
+    pub history_root_hash: [u8; 32],
 
     /// The block timestamp is a Unix epoch time (UTC) when the miner
     /// started hashing the header (according to the miner).
diff --git a/zebra-chain/src/block/serialize.rs b/zebra-chain/src/block/serialize.rs
index 67df3444..2824b9e2 100644
--- a/zebra-chain/src/block/serialize.rs
+++ b/zebra-chain/src/block/serialize.rs
@@ -5,7 +5,6 @@ use std::io;
 use crate::block::difficulty::CompactDifficulty;
 use crate::equihash_solution::EquihashSolution;
 use crate::merkle_tree::MerkleTreeRootHash;
-use crate::note_commitment_tree::SaplingNoteTreeRootHash;
 use crate::serialization::ZcashDeserializeInto;
 use crate::serialization::{ReadZcashExt, SerializationError, ZcashDeserialize, ZcashSerialize};
 
@@ -19,7 +18,7 @@ impl ZcashSerialize for BlockHeader {
         writer.write_u32::<LittleEndian>(self.version)?;
         self.previous_block_hash.zcash_serialize(&mut writer)?;
         writer.write_all(&self.merkle_root_hash.0[..])?;
-        writer.write_all(&self.final_sapling_root_hash.0[..])?;
+        writer.write_all(&self.history_root_hash[..])?;
         // this is a truncating cast, rather than a saturating cast
         // but u32 times are valid until 2106, and our block verification time
         // checks should detect any truncation.
@@ -67,7 +66,7 @@ impl ZcashDeserialize for BlockHeader {
             version,
             previous_block_hash: BlockHeaderHash::zcash_deserialize(&mut reader)?,
             merkle_root_hash: MerkleTreeRootHash(reader.read_32_bytes()?),
-            final_sapling_root_hash: SaplingNoteTreeRootHash(reader.read_32_bytes()?),
+            history_root_hash: reader.read_32_bytes()?,
             // This can't panic, because all u32 values are valid `Utc.timestamp`s
             time: Utc.timestamp(reader.read_u32::<LittleEndian>()? as i64, 0),
             difficulty_threshold: CompactDifficulty(reader.read_u32::<LittleEndian>()?),
diff --git a/zebra-chain/src/block/tests.rs b/zebra-chain/src/block/tests.rs
index e2adfe70..e7a7eee9 100644
--- a/zebra-chain/src/block/tests.rs
+++ b/zebra-chain/src/block/tests.rs
@@ -3,7 +3,6 @@ use super::*;
 use crate::block::difficulty::CompactDifficulty;
 use crate::equihash_solution::EquihashSolution;
 use crate::merkle_tree::MerkleTreeRootHash;
-use crate::note_commitment_tree::SaplingNoteTreeRootHash;
 use crate::serialization::{
     SerializationError, ZcashDeserialize, ZcashDeserializeInto, ZcashSerialize,
 };
@@ -26,7 +25,7 @@ impl Arbitrary for BlockHeader {
             (4u32..(i32::MAX as u32)),
             any::<BlockHeaderHash>(),
             any::<MerkleTreeRootHash>(),
-            any::<SaplingNoteTreeRootHash>(),
+            any::<[u8; 32]>(),
             // time is interpreted as u32 in the spec, but rust timestamps are i64
             (0i64..(u32::MAX as i64)),
             any::<CompactDifficulty>(),
@@ -38,7 +37,7 @@ impl Arbitrary for BlockHeader {
                     version,
                     previous_block_hash,
                     merkle_root_hash,
-                    final_sapling_root_hash,
+                    history_root_hash,
                     timestamp,
                     difficulty_threshold,
                     nonce,
@@ -47,7 +46,7 @@ impl Arbitrary for BlockHeader {
                     version,
                     previous_block_hash,
                     merkle_root_hash,
-                    final_sapling_root_hash,
+                    history_root_hash,
                     time: Utc.timestamp(timestamp, 0),
                     difficulty_threshold,
                     nonce,