diff --git a/files/en-us/games/techniques/2d_collision_detection/index.html b/files/en-us/games/techniques/2d_collision_detection/index.html
index 097785fec4a52f3..052e80a8612859f 100644
--- a/files/en-us/games/techniques/2d_collision_detection/index.html
+++ b/files/en-us/games/techniques/2d_collision_detection/index.html
@@ -174,7 +174,7 @@ <h2 id="Separating_Axis_Theorem">Separating Axis Theorem</h2>
  <li><a href="http://www.sevenson.com.au/actionscript/sat/">Separating Axis Theorem (SAT) explanation</a></li>
  <li><a href="http://www.metanetsoftware.com/technique/tutorialA.html">Collision detection and response</a></li>
  <li><a href="http://gamedevelopment.tutsplus.com/tutorials/collision-detection-using-the-separating-axis-theorem--gamedev-169">Collision detection Using the Separating Axis Theorem</a></li>
- <li><a href="http://www.codezealot.org/archives/55">SAT (Separating Axis Theorem)</a></li>
+ <li><a href="http://www.dyn4j.org/2010/01/sat/">SAT (Separating Axis Theorem)</a></li>
  <li><a href="http://programmerart.weebly.com/separating-axis-theorem.html">Separating Axis Theorem</a></li>
 </ol>