diff --git a/default.nix b/default.nix
index 4b96be2..4a1246e 100644
--- a/default.nix
+++ b/default.nix
@@ -1,17 +1,16 @@
 with (import <nixpkgs> {});
-let asciidoctor_revealjs = bundlerApp {
-  pname = "asciidoctor-revealjs";
-  exes = [ "asciidoctor-revealjs" ];
+let
+  asciidoctor_revealjs = bundlerApp {
+    pname = "asciidoctor-revealjs";
+    exes = [ "asciidoctor-revealjs" ];
+    inherit ruby;
+    gemdir = ./.;
+  };
 
-  inherit ruby;
-  gemdir = ./.;
-};
-
-in
-derivation {
+in derivation {
   name = "kafetech-fai";
   builder = "${bash}/bin/bash";
-  args = [ "-f" ./build.sh ];
+  args = [ ./build.sh ];
   inherit asciidoctor asciidoctor_revealjs coreutils jre graphviz;
   src = ./src;
   system = builtins.currentSystem;