diff --git a/oml/localnodes.py b/oml/localnodes.py
index 87e5003..3e9bbb3 100644
--- a/oml/localnodes.py
+++ b/oml/localnodes.py
@@ -144,6 +144,8 @@ class LocalNodes(dict):
             id = info.properties[b'id'].decode()
             if id == settings.USER_ID:
                 return
+            if len(id) != settings.ID_LENGTH:
+                return
             if state_change is ServiceStateChange.Added:
                 new = id not in self
                 self[id] = {