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-rw-r--r--nixos/modules/services/x11/desktop-managers/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/services/x11/desktop-managers/default.nix b/nixos/modules/services/x11/desktop-managers/default.nix
index 0fea74d5ba7..3578d702b28 100644
--- a/nixos/modules/services/x11/desktop-managers/default.nix
+++ b/nixos/modules/services/x11/desktop-managers/default.nix
@@ -50,10 +50,10 @@ in
       };
 
       default = mkOption {
+        type = types.uniq types.string;
         default = "";
         example = "none";
         description = "Default desktop manager loaded if none have been chosen.";
-        merge = mergeOneOption;
         apply = defaultDM:
           if defaultDM == "" && cfg.session.list != [] then
             (head cfg.session.list).name