diff --git a/tm-monitor/monitor/monitor.go b/tm-monitor/monitor/monitor.go
index c32361221..022e1db7c 100644
--- a/tm-monitor/monitor/monitor.go
+++ b/tm-monitor/monitor/monitor.go
@@ -193,7 +193,7 @@ func (m *Monitor) recalculateNetworkUptimeLoop() {
 func (m *Monitor) updateNumValidatorLoop() {
 	rand.Seed(time.Now().Unix())
 
-	var height uint64
+	var height int64
 	var num int
 	var err error
 
diff --git a/tm-monitor/monitor/network.go b/tm-monitor/monitor/network.go
index 00d41f4c0..2a2e4f0c8 100644
--- a/tm-monitor/monitor/network.go
+++ b/tm-monitor/monitor/network.go
@@ -33,7 +33,7 @@ const (
 
 // Common statistics for network of nodes
 type Network struct {
-	Height uint64 `json:"height"`
+	Height int64 `json:"height"`
 
 	AvgBlockTime      float64 `json:"avg_block_time" wire:"unsafe"` // ms (avg over last minute)
 	blockTimeMeter    metrics.Meter
@@ -73,11 +73,11 @@ func (n *Network) NewBlock(b tmtypes.Header) {
 	n.mu.Lock()
 	defer n.mu.Unlock()
 
-	if n.Height >= uint64(b.Height) {
+	if n.Height >= b.Height {
 		return
 	}
 
-	n.Height = uint64(b.Height)
+	n.Height = b.Height
 
 	n.blockTimeMeter.Mark(1)
 	if n.blockTimeMeter.Rate1() > 0.0 {
@@ -164,7 +164,7 @@ func (n *Network) updateHealth() {
 	}
 }
 
-func (n *Network) UpdateNumValidatorsForHeight(num int, height uint64) {
+func (n *Network) UpdateNumValidatorsForHeight(num int, height int64) {
 	n.mu.Lock()
 	defer n.mu.Unlock()
 
diff --git a/tm-monitor/monitor/network_test.go b/tm-monitor/monitor/network_test.go
index 54627a697..d01afaf0d 100644
--- a/tm-monitor/monitor/network_test.go
+++ b/tm-monitor/monitor/network_test.go
@@ -13,7 +13,7 @@ func TestNetworkNewBlock(t *testing.T) {
 	n := monitor.NewNetwork()
 
 	n.NewBlock(tmtypes.Header{Height: 5, NumTxs: 100})
-	assert.Equal(t, uint64(5), n.Height)
+	assert.Equal(t, int64(5), n.Height)
 	assert.Equal(t, 0.0, n.AvgBlockTime)
 	assert.Equal(t, 0.0, n.AvgTxThroughput)
 }
diff --git a/tm-monitor/monitor/node.go b/tm-monitor/monitor/node.go
index f8fdc3add..b00fc8a7d 100644
--- a/tm-monitor/monitor/node.go
+++ b/tm-monitor/monitor/node.go
@@ -25,7 +25,7 @@ type Node struct {
 
 	Name         string  `json:"name"`
 	Online       bool    `json:"online"`
-	Height       uint64  `json:"height"`
+	Height       int64   `json:"height"`
 	BlockLatency float64 `json:"block_latency" wire:"unsafe"` // ms, interval between block commits
 
 	// em holds the ws connection. Each eventMeter callback is called in a separate go-routine.
@@ -128,7 +128,7 @@ func newBlockCallback(n *Node) em.EventCallbackFunc {
 	return func(metric *em.EventMetric, data interface{}) {
 		block := data.(tmtypes.TMEventData).Unwrap().(tmtypes.EventDataNewBlockHeader).Header
 
-		n.Height = uint64(block.Height)
+		n.Height = block.Height
 		n.logger.Info("new block", "height", block.Height, "numTxs", block.NumTxs)
 
 		if n.blockCh != nil {
@@ -183,7 +183,7 @@ func (n *Node) RestartEventMeterBackoff() error {
 	}
 }
 
-func (n *Node) NumValidators() (height uint64, num int, err error) {
+func (n *Node) NumValidators() (height int64, num int, err error) {
 	height, vals, err := n.validators()
 	if err != nil {
 		return 0, 0, err
@@ -191,12 +191,12 @@ func (n *Node) NumValidators() (height uint64, num int, err error) {
 	return height, len(vals), nil
 }
 
-func (n *Node) validators() (height uint64, validators []*tmtypes.Validator, err error) {
+func (n *Node) validators() (height int64, validators []*tmtypes.Validator, err error) {
 	vals := new(ctypes.ResultValidators)
 	if _, err = n.rpcClient.Call("validators", nil, vals); err != nil {
 		return 0, make([]*tmtypes.Validator, 0), err
 	}
-	return uint64(vals.BlockHeight), vals.Validators, nil
+	return vals.BlockHeight, vals.Validators, nil
 }
 
 func (n *Node) checkIsValidatorLoop() {
diff --git a/tm-monitor/monitor/node_test.go b/tm-monitor/monitor/node_test.go
index d79725c8b..79b4675ae 100644
--- a/tm-monitor/monitor/node_test.go
+++ b/tm-monitor/monitor/node_test.go
@@ -15,7 +15,7 @@ import (
 )
 
 const (
-	blockHeight = 1
+	blockHeight = int64(1)
 )
 
 func TestNodeStartStop(t *testing.T) {
@@ -35,7 +35,7 @@ func TestNodeNewBlockReceived(t *testing.T) {
 	blockHeader := &tmtypes.Header{Height: 5}
 	emMock.Call("eventCallback", &em.EventMetric{}, tmtypes.TMEventData{tmtypes.EventDataNewBlockHeader{blockHeader}})
 
-	assert.Equal(t, uint64(5), n.Height)
+	assert.Equal(t, int64(5), n.Height)
 	assert.Equal(t, *blockHeader, <-blockCh)
 }
 
@@ -69,7 +69,7 @@ func TestNumValidators(t *testing.T) {
 
 	height, num, err := n.NumValidators()
 	assert.Nil(t, err)
-	assert.Equal(t, uint64(blockHeight), height)
+	assert.Equal(t, blockHeight, height)
 	assert.Equal(t, 1, num)
 }