diff --git a/CM2030 Graphics Programming/Topic 1/1.5.1/sketch.js b/CM2030 Graphics Programming/Topic 1/1.5.1/sketch.js
index 7ed621a..0b7f028 100644
--- a/CM2030 Graphics Programming/Topic 1/1.5.1/sketch.js	
+++ b/CM2030 Graphics Programming/Topic 1/1.5.1/sketch.js	
@@ -36,7 +36,7 @@ class Button
     {
         if(this.state == true) fill (255);
         else fill(0);
-        rect(locX, locY, w, h);
+        rect(this.locX, this.locY, this.w, this.h);
     }
     flick(x, y)
     {