diff --git a/i3/.local/bin/lock.sh b/i3/.local/bin/lock.sh
index c7457f4..790ebf9 100755
--- a/i3/.local/bin/lock.sh
+++ b/i3/.local/bin/lock.sh
@@ -9,9 +9,9 @@ EFFECT='boxblur=5:1'
 PX=0
 PY=0
 # lockscreen image info
-R=$(file $LOCKSCREEN | grep -o '[0-9]* x [0-9]*')
-RX=$(echo $R | cut -d' ' -f 1)
-RY=$(echo $R | cut -d' ' -f 3)
+R=$(identify $LOCKSCREEN | grep -o '[0-9]*x[0-9]*' | head -1)
+RX=$(echo $R | cut -d'x' -f 1)
+RY=$(echo $R | cut -d'x' -f 2)
 
 OVERLAY=''
 INPUT=''