diff --git a/pkg/query-service/app/clickhouseReader/reader.go b/pkg/query-service/app/clickhouseReader/reader.go
index 320f7fe5b3..25b2792939 100644
--- a/pkg/query-service/app/clickhouseReader/reader.go
+++ b/pkg/query-service/app/clickhouseReader/reader.go
@@ -3219,7 +3219,7 @@ func (r *ClickHouseReader) GetSamplesInfoInLastHeartBeatInterval(ctx context.Con
 
 	var totalSamples uint64
 
-	queryStr := fmt.Sprintf("select count() from %s.%s where metric_name not like 'signoz_%%' and timestamp_ms > toUnixTimestamp(now()-toIntervalMinute(%d))*1000;", signozMetricDBName, signozSampleTableName, int(interval.Minutes()))
+	queryStr := fmt.Sprintf("select count() from %s.%s where metric_name not like 'signoz_%%' and unix_milli > toUnixTimestamp(now()-toIntervalMinute(%d))*1000;", signozMetricDBName, signozSampleTableName, int(interval.Minutes()))
 
 	r.db.QueryRow(ctx, queryStr).Scan(&totalSamples)