diff --git a/config.def.h b/config.def.h
index 3f84949..b1b4073 100644
--- a/config.def.h
+++ b/config.def.h
@@ -294,7 +294,7 @@ static const Key keys[] = {
   { 0,                       XF86XK_AudioRaiseVolume,  spawn,     SHCMD("exec pactl set-sink-volume @DEFAULT_SINK@ +5%")},
   { 0,                       XF86XK_AudioLowerVolume,  spawn,     SHCMD("exec pactl set-sink-volume @DEFAULT_SINK@ -5%")},
   { 0,                       XF86XK_MonBrightnessUp,  spawn,      SHCMD("exec brightnessctl set +5%") },
-  { 0,                       XF86XK_MonBrightnessDown,  spawn,      SHCMD("exec brightnessctl set -5%") },
+  { 0,                       XF86XK_MonBrightnessDown,  spawn,      SHCMD("exec brightnessctl set 5%-") },
   { 0,                       XF86XK_AudioMute,  spawn,     SHCMD("exec pactl set-sink-mute @DEFAULT_SINK@ toggle")},
   { 0,                       XF86XK_AudioPlay,  spawn,     SHCMD("exec playerctl play-pause")},
   { 0,                       XF86XK_AudioPause,  spawn,     SHCMD("exec playerctl play-pause")},