diff --git a/sync/src/chain.rs b/sync/src/chain.rs
index dd89cdbf8..6a7add27f 100644
--- a/sync/src/chain.rs
+++ b/sync/src/chain.rs
@@ -245,8 +245,8 @@ impl ChainSync {
 			start_block_number: self.starting_block,
 			last_imported_block_number: self.last_imported_block,
 			highest_block_number: self.highest_block,
-			blocks_received: match self.last_imported_block { None => 0, Some(x) => x - self.starting_block },
-			blocks_total: match self.highest_block { None => 0, Some(x) => x - self.starting_block },
+			blocks_received: match self.last_imported_block { Some(x) if x > self.starting_block => x - self.starting_block, _ => 0 },
+			blocks_total: match self.highest_block { Some(x) if x > self.starting_block => x - self.starting_block, _ => 0 },
 			num_peers: self.peers.len(),
 			num_active_peers: self.peers.values().filter(|p| p.asking != PeerAsking::Nothing).count(),
 			mem_used: