diff --git a/evwkow5289.js b/evwkow5289.js
index a5e9c9d..695b738 100644
--- a/evwkow5289.js
+++ b/evwkow5289.js
@@ -11,8 +11,8 @@ if (!this.initialized) {
 		GameLib.Event.WINDOW_RESIZE,
 		function(data) {
 			this.size = data;
-			this.x = size.width / 2;
-			this.y = size.height / 2;
+			this.x = this.size.width / 2;
+			this.y = this.size.height / 2;
 		}.bind(this)
 	)