diff --git a/CHANGELOG.md b/CHANGELOG.md
index e685ca318..5665b432f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,7 @@ The following changes all effect the Matter JS Pointer Constraint class:
 * `KeyboardPlugin.time` has moved from being a property to being a getter, which returns the time from the InputManager.
 * The `scale` property has been added to the `Scene` class (thanks @strangeweekend)
 * `Matter.World.remove` now uses the `Composite.remove` method internally. Previously, it used `Composite.removeBody` which only allowed it to remove bodies from the simulation. Now, it can remove any type of Matter object.
+* When the Matter World creates its wall bounds, the left and right walls now extend further up and down than before, so that in a 4-wall setting there are no gaps in the corners, which previously allowed for fast moving objects that hit a corner intersection point to sometimes travel through it.
 
 ### Bug Fixes
 
diff --git a/src/physics/matter-js/World.js b/src/physics/matter-js/World.js
index 228083d89..2ae5c2d43 100644
--- a/src/physics/matter-js/World.js
+++ b/src/physics/matter-js/World.js
@@ -328,8 +328,8 @@ var World = new Class({
         if (top === undefined) { top = true; }
         if (bottom === undefined) { bottom = true; }
 
-        this.updateWall(left, 'left', x - thickness, y, thickness, height);
-        this.updateWall(right, 'right', x + width, y, thickness, height);
+        this.updateWall(left, 'left', x - thickness, y - thickness, thickness, height + (thickness * 2));
+        this.updateWall(right, 'right', x + width, y - thickness, thickness, height + (thickness * 2));
         this.updateWall(top, 'top', x, y - thickness, width, thickness);
         this.updateWall(bottom, 'bottom', x, y + height, width, thickness);