diff --git a/services/backup.js b/services/backup.js
index 9a30896cc..1398c4ea3 100644
--- a/services/backup.js
+++ b/services/backup.js
@@ -20,7 +20,7 @@ async function regularBackup() {
 async function backupNow() {
     const now = utils.nowTimestamp();
 
-    const date_str = new Date().toISOString().substr(0, 19);
+    const date_str = new Date().toISOString().substr(0, 19).replace(/:/g, '');
 
     const backupFile = dataDir.BACKUP_DIR + "/" + "backup-" + date_str + ".db";