diff --git a/chain/src/chain.rs b/chain/src/chain.rs
index a4e3a69804..f4799d7bbf 100644
--- a/chain/src/chain.rs
+++ b/chain/src/chain.rs
@@ -1334,7 +1334,7 @@ impl Chain {
 		min_height: Option<u64>,
 		max_height: Option<u64>,
 	) -> Result<BlockHeader, Error> {
-		let txhashset = self.txhashset.read();
+		let header_pmmr = self.header_pmmr.read();
 
 		let mut min = min_height.unwrap_or(0).saturating_sub(1);
 		let mut max = match max_height {
@@ -1344,11 +1344,13 @@ impl Chain {
 
 		loop {
 			let search_height = max - (max - min) / 2;
-			let h = txhashset.get_header_by_height(search_height)?;
+			let hash = header_pmmr.get_header_hash_by_height(search_height)?;
+			let h = self.get_block_header(&hash)?;
 			if search_height == 0 {
 				return Ok(h);
 			}
-			let h_prev = txhashset.get_header_by_height(search_height - 1)?;
+			let hash_prev = header_pmmr.get_header_hash_by_height(search_height - 1)?;
+			let h_prev = self.get_block_header(&hash_prev)?;
 			if kernel_mmr_index > h.kernel_mmr_size {
 				min = search_height;
 			} else if kernel_mmr_index < h_prev.kernel_mmr_size {