diff --git a/painter.js b/painter.js
index d11f4e5..98cec1c 100644
--- a/painter.js
+++ b/painter.js
@@ -408,6 +408,7 @@ Component({
         new Pen(photoContext, palette).paint(() => {
           this.saveImgToLocal();
         });
+        setStringPrototype(this.screenK, 1);
       });
     },