diff --git a/kybackup/module/ghostimage.cpp b/kybackup/module/ghostimage.cpp
index 6746d59..3babce1 100755
--- a/kybackup/module/ghostimage.cpp
+++ b/kybackup/module/ghostimage.cpp
@@ -850,6 +850,8 @@ void GhostImage::on_ghost_start()
     backupWrapper.m_uuid = m_uuid;
     backupWrapper.m_type = BackupType::GHOST_IMAGE;
     backupWrapper.m_backupName = createGhostImageName(m_backupName);
+    QString prePath = Utils::getSysRootPath() + "/media";
+    prePath = prePath.replace("//", "/");
     if (m_iPosition != BackupPosition::CUSTOMIZE && m_prefixDestPath.startsWith(prePath)) {
         backupWrapper.m_iPosition = BackupPosition::UDISK;
     } else {