diff --git a/pendulum/main.js b/pendulum/main.js
index 2599abc8..700a9dc3 100644
--- a/pendulum/main.js
+++ b/pendulum/main.js
@@ -173,7 +173,7 @@ function simulate()
 
 function setup() 
 {
-    canvas = createCanvas(displayWidth - 100, displayHeight / 4 * 3);
+    canvas = createCanvas(displayHeight / 4 * 3, displayHeight / 4 * 3);
     canvas.mouseClicked(handleClick);
 }