diff --git a/confluent_server/confluent/networking/macmap.py b/confluent_server/confluent/networking/macmap.py
index 933a873e..ec4759c6 100644
--- a/confluent_server/confluent/networking/macmap.py
+++ b/confluent_server/confluent/networking/macmap.py
@@ -297,6 +297,7 @@ def _finish_update(completions):
 
 def _full_updatemacmap(configmanager):
     global vintage
+    global _apimacmap
     global _macmap
     global _nodesbymac
     global _switchportmap