diff --git a/src/DotRecast.Detour/NavMesh.cs b/src/DotRecast.Detour/NavMesh.cs
index 2f1fa8a..c2dfa59 100644
--- a/src/DotRecast.Detour/NavMesh.cs
+++ b/src/DotRecast.Detour/NavMesh.cs
@@ -21,8 +21,6 @@ freely, subject to the following restrictions:
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
-using System.Numerics;
-using System.Runtime.InteropServices.ComTypes;
 using DotRecast.Core;
 using DotRecast.Detour.QueryResults;