diff --git a/test/test-windows.js b/test/test-windows.js
index f549921..ae98a1c 100755
--- a/test/test-windows.js
+++ b/test/test-windows.js
@@ -19,7 +19,7 @@ function AvgFunction() {
   self.make = function() { return new AvgFunction(); };
 };
 
-CountFunction.protorype = new eep.AggregateFunction();
+CountFunction.prototype = new eep.AggregateFunction();
 function CountFunction() {
     var self = this; var count = 0;