diff --git a/app/vminsert/influx/request_handler.go b/app/vminsert/influx/request_handler.go
index 8647f8f221..476b99060d 100644
--- a/app/vminsert/influx/request_handler.go
+++ b/app/vminsert/influx/request_handler.go
@@ -21,7 +21,7 @@ import (
 )
 
 var (
-	measurementFieldSeparator = flag.String("influxMeasurementFieldSeparator", ".", "Separator for `{measurement}{separator}{field_name}` metric name when inserted via Influx line protocol")
+	measurementFieldSeparator = flag.String("influxMeasurementFieldSeparator", "_", "Separator for `{measurement}{separator}{field_name}` metric name when inserted via Influx line protocol")
 	skipSingleField           = flag.Bool("influxSkipSingleField", false, "Uses `{measurement}` instead of `{measurement}{separator}{field_name}` for metic name if Influx line contains only a single field")
 )