diff --git a/app/vminsert/influx/request_handler.go b/app/vminsert/influx/request_handler.go
index e96492394..d425b7db1 100644
--- a/app/vminsert/influx/request_handler.go
+++ b/app/vminsert/influx/request_handler.go
@@ -120,7 +120,7 @@ func insertRows(at *auth.Token, db string, rows []parser.Row, mayOverrideAccount
 			}
 			labels = ic.Labels
 			if !hasRelabeling {
-				labels = labels[labelsLen : labelsLen+1]
+				labels = labels[len(labels)-1:]
 			}
 			ic.MetricNameBuf = ic.MetricNameBuf[:metricNameBufLen]
 			for i := range labels {