diff --git a/cmd/migrate/main.go b/cmd/migrate/main.go
index 477afe4a9c86..b60a8533c984 100644
--- a/cmd/migrate/main.go
+++ b/cmd/migrate/main.go
@@ -24,6 +24,7 @@ import (
 	"github.com/grafana/loki/pkg/storage/config"
 	"github.com/grafana/loki/pkg/storage/stores/shipper/indexshipper"
 	"github.com/grafana/loki/pkg/util/cfg"
+	"github.com/grafana/loki/pkg/util/constants"
 	util_log "github.com/grafana/loki/pkg/util/log"
 	"github.com/grafana/loki/pkg/validation"
 )
@@ -48,7 +49,7 @@ func main() {
 	batch := flag.Int("batchLen", 500, "Specify how many chunks to read/write in one batch")
 	shardBy := flag.Duration("shardBy", 6*time.Hour, "Break down the total interval into shards of this size, making this too small can lead to syncing a lot of duplicate chunks")
 	parallel := flag.Int("parallel", 8, "How many parallel threads to process each shard")
-	metricsNamespace := flag.String("metrics.namespace", "cortex", "Namespace of the generated metrics")
+	metricsNamespace := flag.String("metrics.namespace", constants.Loki, "Namespace of the generated metrics")
 	flag.Parse()
 
 	go func() {
diff --git a/pkg/loki/loki.go b/pkg/loki/loki.go
index 54a0a52275dc..4c30f9007a34 100644
--- a/pkg/loki/loki.go
+++ b/pkg/loki/loki.go
@@ -149,7 +149,7 @@ func (c *Config) RegisterFlags(f *flag.FlagSet) {
 
 	f.DurationVar(&c.ShutdownDelay, "shutdown-delay", 0, "How long to wait between SIGTERM and shutdown. After receiving SIGTERM, Loki will report 503 Service Unavailable status via /ready endpoint.")
 
-	f.StringVar(&c.MetricsNamespace, "metrics-namespace", "cortex", "Namespace of the metrics that in previous releases had cortex as namespace.")
+	f.StringVar(&c.MetricsNamespace, "metrics-namespace", "loki", "Namespace of the metrics that in previous releases had cortex as namespace.")
 
 	c.registerServerFlagsWithChangedDefaultValues(f)
 	c.Common.RegisterFlags(f)