diff --git a/pkgs/applications/editors/yi/wrapper.nix b/pkgs/applications/editors/yi/wrapper.nix
index 962537fdf2f0..98b1697e9e70 100644
--- a/pkgs/applications/editors/yi/wrapper.nix
+++ b/pkgs/applications/editors/yi/wrapper.nix
@@ -1,12 +1,14 @@
 # To use this for hacking of your Yi config file, drop into a shell
 # with env attribute.
-{ lib, stdenv, makeWrapper
-, haskellPackages
-, extraPackages ? (s: [])
+{
+  lib,
+  stdenv,
+  makeWrapper,
+  haskellPackages,
+  extraPackages ? (s: [ ]),
 }:
 let
-  yiEnv = haskellPackages.ghcWithPackages
-    (self: [ self.yi ] ++ extraPackages self);
+  yiEnv = haskellPackages.ghcWithPackages (self: [ self.yi ] ++ extraPackages self);
 in
 stdenv.mkDerivation {
   pname = "yi-custom";