diff --git a/flake.nix b/flake.nix
index d77f7a5..4b7aef5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -26,7 +26,7 @@
         packages.invoiceplane-template = pkgs.stdenv.mkDerivation {
           name = "invoiceplane-template";
           src = ./.;
-          installPhase = '' 
+          installPhase = ''
             mkdir -p $out
             cp *.php $out/
           '';