diff --git a/oni/home/services/stumpwm/config b/oni/home/services/stumpwm/config
index 170f0db..544096c 100644
--- a/oni/home/services/stumpwm/config
+++ b/oni/home/services/stumpwm/config
@@ -5,6 +5,27 @@
 
 (set-prefix-key (kbd "s-x"))
 
+(defvar *screen-locking-hook* nil
+  "Hook that gets called right before the screen gets locked.")
+
+(defvar *screen-unlocked-hook* nil
+  "Hook that gets called right after the screen is unlocked.")
+
+(defun run-screen-unlocked-hook (process)
+  "Run `*screen-unlocked-hook* if PROCESS' status is `:exited'."
+  (when (eq (sb-ext:process-status process) :exited)
+    (run-hook *screen-unlocked-hook*)))
+
+(defcommand lock-screen () ()
+  "Lock the screen using i3lock.
+Run `*screen-locking-hook*' before locking it and run `*screen-unlocked-hook*'
+after it has been unlocked."
+  (run-hook *screen-locking-hook*)
+  (sb-ext:run-program
+   "/usr/bin/i3lock" '("--nofork" "--color=000000")
+   :wait nil
+   :status-hook #'run-screen-unlocked-hook))
+
 (defcommand raise-browser () ()
   "Open or show my browser"
   (run-or-raise "firefox" '(:class "firefox")))
@@ -17,6 +38,7 @@
   "Open or show my terminal"
   (run-or-raise "kitty" '(:class "kitty")))
 
+(define-key *top-map* (kbd "C-M-l") "lock-screen")
 (define-key *top-map* (kbd "s-b") "raise-browser")
 (define-key *top-map* (kbd "s-e") "raise-emacs")
 (define-key *top-map* (kbd "s-t") "raise-terminal")