diff --git a/@xen-orchestra/backups/_deltaVm.js b/@xen-orchestra/backups/_deltaVm.js
index 90565c9a9..db2b62541 100644
--- a/@xen-orchestra/backups/_deltaVm.js
+++ b/@xen-orchestra/backups/_deltaVm.js
@@ -333,7 +333,7 @@ exports.importDeltaVm = defer(async function importDeltaVm(
             VM: vmRef,
           },
           {
-            MAC: newMacAddresses ? vif.MAC : undefined,
+            MAC: newMacAddresses ? undefined : vif.MAC,
           }
         )
       }