diff --git a/instances/templates/instance.html b/instances/templates/instance.html
index b18836a..0ca9c87 100644
--- a/instances/templates/instance.html
+++ b/instances/templates/instance.html
@@ -1052,6 +1052,7 @@
             guessed_name = data['name'].split(".")[0];
             $('#clone_name').val(guessed_name);
             update_clone_disk_name(guessed_name);
+            guess_mac_address('#clone_name', 0);
         });
     }
 </script>
diff --git a/instances/views.py b/instances/views.py
index 76d29ec..028891c 100644
--- a/instances/views.py
+++ b/instances/views.py
@@ -790,7 +790,8 @@ def guess_clone_name(request):
             for line in f:
                 line = line.strip()
                 if "host %s" % prefix in line:
-                    hostname = line.split(' ')[1]
+                    fqdn = line.split(' ')[1]
+                    hostname = fqdn.split('.')[0]
                     if hostname.startswith(prefix) and hostname not in instance_names:
                         return HttpResponse(json.dumps({'name': hostname}))
     return HttpResponse(json.dumps({}));