diff --git a/themes/vertex/startup.lua b/themes/vertex/startup.lua
index b683324..61bf621 100644
--- a/themes/vertex/startup.lua
+++ b/themes/vertex/startup.lua
@@ -5,7 +5,7 @@ local startup =
 {
     awful.spawn.with_shell("nitrogen --set-zoom-fill --no-recurse --random --head=0 ~/Pictures/SFW/Nature"),
     awful.spawn.with_shell("optimus-manager-qt"),
-    os.execute("picom -b"),
+    awful.spawn.with_shell("picom -b"),
 
     -- Mute volume on startup
     os.execute(string.format("amixer set Master 0%%")),