diff --git a/pkgs/by-name/xd/xdg-user-dirs/package.nix b/pkgs/by-name/xd/xdg-user-dirs/package.nix
index c0423a044442..3b87f75c7f07 100644
--- a/pkgs/by-name/xd/xdg-user-dirs/package.nix
+++ b/pkgs/by-name/xd/xdg-user-dirs/package.nix
@@ -37,7 +37,9 @@ stdenv.mkDerivation (finalAttrs: {
     libintl
   ];
 
-  NIX_LDFLAGS = if stdenv.isDarwin then "-liconv" else null;
+  env = lib.optionalAttrs stdenv.isDarwin {
+    NIX_LDFLAGS = "-liconv";
+  };
 
   preFixup = ''
     # fallback values need to be last