diff --git a/consensus/reactor.go b/consensus/reactor.go
index c71f9e0c4..70a79d86a 100644
--- a/consensus/reactor.go
+++ b/consensus/reactor.go
@@ -1087,6 +1087,9 @@ func (ps *PeerState) ensureVoteBitArrays(height int64, numValidators int) {
 // It returns the total number of votes (1 per block). This essentially means
 // the number of blocks for which peer has been sending us votes.
 func (ps *PeerState) RecordVote(vote *types.Vote) int {
+	ps.mtx.Lock()
+	defer ps.mtx.Unlock()
+
 	if ps.stats.lastVoteHeight >= vote.Height {
 		return ps.stats.votes
 	}
@@ -1098,13 +1101,20 @@ func (ps *PeerState) RecordVote(vote *types.Vote) int {
 // VotesSent returns the number of blocks for which peer has been sending us
 // votes.
 func (ps *PeerState) VotesSent() int {
+	ps.mtx.Lock()
+	defer ps.mtx.Unlock()
+
 	return ps.stats.votes
 }
 
-// RecordVote updates internal statistics for this peer by recording the block part.
-// It returns the total number of block parts (1 per block). This essentially means
-// the number of blocks for which peer has been sending us block parts.
+// RecordBlockPart updates internal statistics for this peer by recording the
+// block part. It returns the total number of block parts (1 per block). This
+// essentially means the number of blocks for which peer has been sending us
+// block parts.
 func (ps *PeerState) RecordBlockPart(bp *BlockPartMessage) int {
+	ps.mtx.Lock()
+	defer ps.mtx.Unlock()
+
 	if ps.stats.lastBlockPartHeight >= bp.Height {
 		return ps.stats.blockParts
 	}
@@ -1117,6 +1127,9 @@ func (ps *PeerState) RecordBlockPart(bp *BlockPartMessage) int {
 // BlockPartsSent returns the number of blocks for which peer has been sending
 // us block parts.
 func (ps *PeerState) BlockPartsSent() int {
+	ps.mtx.Lock()
+	defer ps.mtx.Unlock()
+
 	return ps.stats.blockParts
 }