diff --git a/X10D/src/CharExtensions.cs b/X10D/src/CharExtensions.cs
index fe76e58..ab0f64f 100644
--- a/X10D/src/CharExtensions.cs
+++ b/X10D/src/CharExtensions.cs
@@ -3,7 +3,6 @@
     #region Using Directives
 
     using System;
-    using System.Collections;
     using System.Collections.Generic;
     using System.Linq;
     using System.Text;