diff --git a/.pkglists/arch-aur b/.pkglists/arch-aur
index 79c5ade3..6d69f4c9 100644
--- a/.pkglists/arch-aur
+++ b/.pkglists/arch-aur
@@ -13,3 +13,4 @@ sdlmame-wout-toolkits
 tespeed-git
 texlive-dummy
 translate-git
+xss-lock
diff --git a/.xprofile b/.xprofile
index f5dac5d8..88c84fe8 100644
--- a/.xprofile
+++ b/.xprofile
@@ -26,5 +26,8 @@ xcape -e 'Control_L=Escape'
 numlockx on
 # xinput disable "SynPS/2 Synaptics TouchPad"
 
+## Lock screen on sleep.
+xss-lock slock &
+
 ## Hook. Should be sourced last.
 [ -f ~/.xprofile_hook ] && . ~/.xprofile_hook