diff --git a/screenshot.sh b/screenshot.sh
index 95da5f4..3e874fe 100755
--- a/screenshot.sh
+++ b/screenshot.sh
@@ -68,13 +68,13 @@ then
 else
   # If cwebp is available, convert the new screenshot to webp format and delete the original png
   if command -v cwebp > /dev/null; then
-    WIDTH=$(identify -format "%w" $SCR_NEW)
+    WIDTH=$(identify -format "%w" $SCR_LAST)
     TARGET_WIDTH=$(( WIDTH * ${SCALE%%%} / 100 ))
-    echo "Converting $SCR_NEW to webp format with target width $TARGET_WIDTH"
-    # I tried some different cwebp options (-preset text/picture), -m 6), but default seems to give the best results especially given runtime.
-    cwebp -quiet -resize $TARGET_WIDTH 0 $SCR_NEW -o "${SCR_NEW%.png}.webp"
-    rm $SCR_NEW
-    SCR_NEW="${SCR_NEW%.png}.webp"
+    echo "Converting $SCR_LAST to webp format with target width $TARGET_WIDTH"
+    # I tried some different cwebp options (-preset text/picture), -m 6), but default seems to give the best results especially given that it's fast.
+    cwebp -quiet -resize $TARGET_WIDTH 0 $SCR_LAST -o "${SCR_LAST%.png}.webp"
+    rm $SCR_LAST
+    SCR_LAST="${SCR_LAST%.png}.webp"
   else
     # If cwebp is not available, we can still reduce the size of the png by resizing it with mogrify
     mogrify -scale $SCALE $SCR_LAST