diff --git a/chapters/JavaScript_Core/Functional_JavaScript/JavaScript_Generator.md b/chapters/JavaScript_Core/Functional_JavaScript/JavaScript_Generator.md
index 865a0c0..ddd771d 100644
--- a/chapters/JavaScript_Core/Functional_JavaScript/JavaScript_Generator.md
+++ b/chapters/JavaScript_Core/Functional_JavaScript/JavaScript_Generator.md
@@ -55,11 +55,13 @@ for(let value of argumentsIterator) {
 ```
 function* fibonacci() {
   let a = 0, b = 1;
+  var c;
   //1, 2
   while(true) {
     yield a;
+    c = a + b;
     a = b;
-    b = a + b;
+    b = c;
   }
 }
 
@@ -319,4 +321,4 @@ suspend(function*() {
 [^3]: https://github.com/JustinDrake/node-es6-examples#generators
 [^4]: http://dailyjs.com/2013/05/31/suspend/
 [^5]: http://dailyjs.com/2013/10/17/yield/
-[^6]: http://en.wikipedia.org/wiki/Continuation-passing_style
\ No newline at end of file
+[^6]: http://en.wikipedia.org/wiki/Continuation-passing_style