diff --git a/nixos/modules/misc/ids.nix b/nixos/modules/misc/ids.nix
index feb9c68301d..1fd56adfe10 100644
--- a/nixos/modules/misc/ids.nix
+++ b/nixos/modules/misc/ids.nix
@@ -71,7 +71,7 @@ in
       #utmp = 29; # unused
       # ddclient = 30; # converted to DynamicUser = true
       davfs2 = 31;
-      #disnix = 33; # unused
+      disnix = 33;
       osgi = 34;
       tor = 35;
       cups = 36;