diff --git a/src/EcsMask.cs b/src/EcsMask.cs
index 1017283..6cf6423 100644
--- a/src/EcsMask.cs
+++ b/src/EcsMask.cs
@@ -4,7 +4,6 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
 
 namespace DCFApixels.DragonECS
 {