From 24600635755cea965bf21b1b1073076d7bfd498a Mon Sep 17 00:00:00 2001
From: Jan Malakhovski <oxij@oxij.org>
Date: Wed, 25 Apr 2018 00:17:31 +0000
Subject: [PATCH] nixos: installer: cleanup a bit

---
 nixos/modules/installer/cd-dvd/iso-image.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/installer/cd-dvd/iso-image.nix b/nixos/modules/installer/cd-dvd/iso-image.nix
index 83f8a2586bd3..08923970cd38 100644
--- a/nixos/modules/installer/cd-dvd/iso-image.nix
+++ b/nixos/modules/installer/cd-dvd/iso-image.nix
@@ -73,7 +73,8 @@ let
     APPEND ${toString config.boot.loader.grub.memtest86.params}
   '';
 
-  isolinuxCfg = baseIsolinuxCfg + (optionalString config.boot.loader.grub.memtest86.enable isolinuxMemtest86Entry);
+  isolinuxCfg = concatStringsSep "\n"
+    ([ baseIsolinuxCfg ] ++ optional config.boot.loader.grub.memtest86.enable isolinuxMemtest86Entry);
 
   # The EFI boot image.
   efiDir = pkgs.runCommand "efi-directory" {} ''