diff --git a/script/engine.js b/script/engine.js
index 4053d82..6187833 100644
--- a/script/engine.js
+++ b/script/engine.js
@@ -569,7 +569,7 @@
 					Engine.activeModule.keyDown(e);
 				}
 			}
-			return !(jQuery.inArray(e.keycode, [37,38,39,40]));
+			return jQuery.inArray(e.keycode, [37,38,39,40]) < 0;
 		},
 	
 		keyUp: function(e) {