diff --git a/sync/src/synchronization_chain.rs b/sync/src/synchronization_chain.rs
index 7832c8b5..0efb6dd1 100644
--- a/sync/src/synchronization_chain.rs
+++ b/sync/src/synchronization_chain.rs
@@ -310,7 +310,7 @@ impl Chain {
 
 	/// Insert new best block to storage
 	pub fn insert_best_block(&mut self, hash: H256, block: &IndexedBlock) -> Result<BlockInsertionResult, db::Error> {
-		let is_appending_to_main_branch = &self.best_storage_block.hash == block.hash();
+		let is_appending_to_main_branch = self.best_storage_block.hash == block.header().previous_header_hash;
 
 		// insert to storage
 		let storage_insertion = try!(self.storage.insert_indexed_block(&block));