diff --git a/subiquity/models/filesystem.py b/subiquity/models/filesystem.py
index 46cc0200..8728755e 100644
--- a/subiquity/models/filesystem.py
+++ b/subiquity/models/filesystem.py
@@ -681,7 +681,7 @@ class _Device(_Formattable, ABC):
 
 
 @fsobj("dasd")
-class Dasd(_Device):
+class Dasd:
     device_id = attr.ib()
     blocksize = attr.ib()
     disk_layout = attr.ib()