diff --git a/metrics/metrics.go b/metrics/metrics.go
index 1b5fb12..c978430 100644
--- a/metrics/metrics.go
+++ b/metrics/metrics.go
@@ -2,9 +2,11 @@ package metrics
 
 import (
 	"os"
+	"regexp"
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
+	log "github.com/sirupsen/logrus"
 )
 
 var (
@@ -19,7 +21,11 @@ var (
 func getHostname() string {
 	hostname, err := os.Hostname()
 	if err != nil {
-		hostname = "ytsync-unknown"
+		hostname = "ytsync_unknown"
 	}
-	return hostname
+	reg, err := regexp.Compile("[^a-zA-Z0-9_]+")
+	if err != nil {
+		log.Fatal(err)
+	}
+	return reg.ReplaceAllString(hostname, "_")
 }