diff --git a/src/BitSet512.cs b/src/BitSet512.cs
index 8d18741..3d98976 100644
--- a/src/BitSet512.cs
+++ b/src/BitSet512.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 
 namespace MoonTools.FastCollections
 {