diff --git a/gns3server/controller/appliance.py b/gns3server/controller/appliance.py
index 8960233b..9cfb00f0 100644
--- a/gns3server/controller/appliance.py
+++ b/gns3server/controller/appliance.py
@@ -42,8 +42,8 @@ class Appliance:
 
         # Version of the gui before 2.1 use linked_base
         # and the server linked_clone
-        if "linked_base" in data:
-            self._data["linked_clone"] = data.pop("linked_base")
+        if "linked_base" in self._data:
+            self._data["linked_clone"] = self._data.pop("linked_base")
         if data["node_type"] == "iou" and "image" in data:
             del self._data["image"]
         self._builtin = builtin