diff --git a/cpu.js b/cpu.js
index ff3a52f..7022b30 100755
--- a/cpu.js
+++ b/cpu.js
@@ -3937,4 +3937,4 @@ window.CPU_65816 = function() {
     this.cycle_count = 0;
   };
 };
-})(window);
+})(this);