diff --git a/script.js b/script.js
index 0c19737..8480130 100644
--- a/script.js
+++ b/script.js
@@ -56,7 +56,6 @@ function sketchHandler(){
     addColorToCell(e.target, inkMode)
 
     sketchBoard.addEventListener('mouseover', highlightCallback)
-    window.addEventListener('mouseup', clearHighlightCallback);
   })
     
   // detaching the mouseover events to prevent unnecessary sketch-cell coloring