diff --git a/pkgs/nixfiles/nixfiles-auto-install.sh b/pkgs/nixfiles/nixfiles-auto-install.sh
index 15a58c6..9f015cc 100644
--- a/pkgs/nixfiles/nixfiles-auto-install.sh
+++ b/pkgs/nixfiles/nixfiles-auto-install.sh
@@ -107,7 +107,8 @@ sed -i "s~# boot\.loader\.grub\.device = \"/dev/sda\";~boot\.loader\.grub\.devic
 
 echo "[I] Install NixOS"
 
-export NIX_CONFIG=<(printf "experimental-features = flakes nix-command\nsubstituters = https://nix-cache.clerie.de\ntrusted-public-keys = nix-cache.clerie.de:bAt1GJTS9BOTcXFWj3nURrSlcjqikCev9yDvqArMP5g=\n" )
+NIX_CONFIG=$(printf "extra-experimental-features = flakes nix-command\nextra-substituters = https://nix-cache.clerie.de\nextra-trusted-public-keys = nix-cache.clerie.de:bAt1GJTS9BOTcXFWj3nURrSlcjqikCev9yDvqArMP5g=\n")
+export NIX_CONFIG
 
 nixos-install --flake "/mnt/etc/nixos#${hostname}" --root /mnt --no-root-password