diff --git a/lib/default.nix b/lib/default.nix
index 9f62428..f2908f5 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -159,7 +159,7 @@ let {
   mount.noop = q: x: {};
 
   mount.partition = q: x:
-    mount-f { device = "\"\${${helper.device-id q.device}}\"-part" + toString q.index; } x.content;
+    mount-f { device = "\"\${${q.device}}\"-part" + toString q.index; } x.content;
 
   mount.table = q: x: (
     recursiveUpdate