diff --git a/util/stats/query_stats.go b/util/stats/query_stats.go
index b1c91a69fd..0e0e1871c3 100644
--- a/util/stats/query_stats.go
+++ b/util/stats/query_stats.go
@@ -182,7 +182,7 @@ func (qs *QuerySamples) totalSamplesPerStepPoints() []stepStat {
 
 	ts := make([]stepStat, len(qs.TotalSamplesPerStep))
 	for i, c := range qs.TotalSamplesPerStep {
-		ts[i] = stepStat{T: qs.startTimestamp + int64(i)*qs.interval, V: c}
+		ts[i] = stepStat{T: qs.StartTimestamp + int64(i)*qs.Interval, V: c}
 	}
 	return ts
 }
@@ -246,8 +246,8 @@ type QuerySamples struct {
 	TotalSamplesPerStep []int64
 
 	EnablePerStepStats bool
-	startTimestamp     int64
-	interval           int64
+	StartTimestamp     int64
+	Interval           int64
 }
 
 type Stats struct {
@@ -262,8 +262,8 @@ func (qs *QuerySamples) InitStepTracking(start, end, interval int64) {
 
 	numSteps := int((end-start)/interval) + 1
 	qs.TotalSamplesPerStep = make([]int64, numSteps)
-	qs.startTimestamp = start
-	qs.interval = interval
+	qs.StartTimestamp = start
+	qs.Interval = interval
 }
 
 // IncrementSamplesAtStep increments the total samples count. Use this if you know the step index.
@@ -287,7 +287,7 @@ func (qs *QuerySamples) IncrementSamplesAtTimestamp(t, samples int64) {
 	qs.TotalSamples += samples
 
 	if qs.TotalSamplesPerStep != nil {
-		i := int((t - qs.startTimestamp) / qs.interval)
+		i := int((t - qs.StartTimestamp) / qs.Interval)
 		qs.TotalSamplesPerStep[i] += samples
 	}
 }