diff --git a/tools/emacs-pkgs/nix-util/nix-util.el b/tools/emacs-pkgs/nix-util/nix-util.el
index f37cdcc71..533e7e6f3 100644
--- a/tools/emacs-pkgs/nix-util/nix-util.el
+++ b/tools/emacs-pkgs/nix-util/nix-util.el
@@ -1,4 +1,4 @@
-;;; nix-util.el --- Utilities for dealing with Nix code. -*- lexical-binding: true; -*-
+;;; nix-util.el --- Utilities for dealing with Nix code. -*- lexical-binding: t; -*-
 ;;
 ;; Copyright (C) 2019 Google Inc.
 ;;
diff --git a/tools/emacs/config/init.el b/tools/emacs/config/init.el
index 3ca329ce5..d601efa67 100644
--- a/tools/emacs/config/init.el
+++ b/tools/emacs/config/init.el
@@ -168,6 +168,7 @@
   :hook ((nix-mode . (lambda ()
                        (setq indent-line-function #'nix-indent-line)))))
 
+(use-package nix-util)
 (use-package nginx-mode)
 (use-package rust-mode)
 (use-package terraform-mode)