diff --git a/x-auto b/x-auto
index 3e7516b..9c463f8 100755
--- a/x-auto
+++ b/x-auto
@@ -5,7 +5,7 @@ if [ "$#" -lt 1 ]; then
     set -- "$@" above
 fi
 
-primary=eDP1
+primary=$(xrandr | awk '/primary/ { print $1}')
 
 # position: something xrandr understands
 position=$1; shift