diff --git a/src/pixi/geom/Matrix.js b/src/pixi/geom/Matrix.js
index cd476b2..b0f043f 100644
--- a/src/pixi/geom/Matrix.js
+++ b/src/pixi/geom/Matrix.js
@@ -133,8 +133,8 @@
 {
     newPos = newPos || new PIXI.Point();
 
-    newPos.x = this.a * pos.x + this.b * pos.y + this.tx;
-    newPos.y = this.c * pos.x + this.d * pos.y + this.ty;
+    newPos.x = this.a * pos.x + this.c * pos.y + this.tx;
+    newPos.y = this.b * pos.x + this.d * pos.y + this.ty;
 
     return newPos;
 };