diff --git a/secop/devices.py b/secop/devices.py
index 11bf741..42c8a03 100644
--- a/secop/devices.py
+++ b/secop/devices.py
@@ -97,7 +97,7 @@ class NicosSecopClient(SecopClient):
             return name
         if not self.forbidden_names:
             self.forbidden_names.update(k.lower() for k in dir(SecopMoveable))
-        name = super().internalize_name(name)
+        name = super().internalize_name(name).lower()
         match = self.MANGLED.match(name)
         if match:
             basename, postfix = match.groups()