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-rw-r--r--nixpkgs/nixos/modules/services/x11/desktop-managers/phosh.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/nixos/modules/services/x11/desktop-managers/phosh.nix b/nixpkgs/nixos/modules/services/x11/desktop-managers/phosh.nix
index 3cfa6e044b73..e4cd9fd99e40 100644
--- a/nixpkgs/nixos/modules/services/x11/desktop-managers/phosh.nix
+++ b/nixpkgs/nixos/modules/services/x11/desktop-managers/phosh.nix
@@ -100,7 +100,7 @@ let
     };
   };
 
-  optionalKV = k: v: if v == null then "" else "${k} = ${builtins.toString v}";
+  optionalKV = k: v: optionalString (v != null) "${k} = ${builtins.toString v}";
 
   renderPhocOutput = name: output: let
     modelines = if builtins.isList output.modeline