diff --git a/lib/fudo/initrd-network.nix b/lib/fudo/initrd-network.nix
index af58c85..84601d5 100644
--- a/lib/fudo/initrd-network.nix
+++ b/lib/fudo/initrd-network.nix
@@ -10,10 +10,7 @@ let
   concatLists = lsts: concatMap (i: i) lsts;
 
   gen-sshfp-records-pkg = hostname: pubkey: let
-    pubkey-file = builtins.writeTextFile {
-      name = "${hostname}-initrd-ssh-pubkey";
-      text = pubkey;
-    };
+    pubkey-file = writeText "${hostname}-initrd-ssh-pubkey" pubkey;
   in pkgs.stdenv.mkDerivation {
     name = "${hostname}-initrd-ssh-firngerprint";