diff --git a/packages/xo-server/src/xo-mixins/backups-ng/index.js b/packages/xo-server/src/xo-mixins/backups-ng/index.js
index 47681cc32..6fa445849 100644
--- a/packages/xo-server/src/xo-mixins/backups-ng/index.js
+++ b/packages/xo-server/src/xo-mixins/backups-ng/index.js
@@ -1024,7 +1024,7 @@ export default class BackupNg {
 
       const bypassVdiChainsCheck: boolean = getSetting(settings, 'bypassVdiChainsCheck', [vmUuid, ''])
       if (!bypassVdiChainsCheck) {
-        xapi._assertHealthyVdiChains(vm)
+        await xapi.VM_assertHealthyVdiChains(vm.$ref)
       }
 
       const offlineSnapshot: boolean = getSetting(settings, 'offlineSnapshot', [vmUuid, ''])