diff --git a/lass/5pkgs/xmonad-lass.nix b/lass/5pkgs/xmonad-lass.nix
index 7d1f44fb7..96b12b9d4 100644
--- a/lass/5pkgs/xmonad-lass.nix
+++ b/lass/5pkgs/xmonad-lass.nix
@@ -111,7 +111,7 @@ displaySomeException = displayException
 
 myKeyMap :: [([Char], X ())]
 myKeyMap =
-    [ ("M4-<F11>", spawn "i3lock -i /var/lib/wallpaper/wallpaper -f")
+    [ ("M4-<F11>", spawn "${pkgs.i3lock}/bin/i3lock -i /var/lib/wallpaper/wallpaper -f")
     , ("M4-p", spawn "${pkgs.pass}/bin/passmenu --type")
     , ("<XF86AudioRaiseVolume>", spawn "${pkgs.pulseaudioLight.out}/bin/pactl -- set-sink-volume 0 +4%")
     , ("<XF86AudioLowerVolume>", spawn "${pkgs.pulseaudioLight.out}/bin/pactl -- set-sink-volume 0 -4%")