diff --git a/src/DotRecast.Recast.Demo/Draw/DebugDraw.cs b/src/DotRecast.Recast.Demo/Draw/DebugDraw.cs
index f82defc..7ffee95 100644
--- a/src/DotRecast.Recast.Demo/Draw/DebugDraw.cs
+++ b/src/DotRecast.Recast.Demo/Draw/DebugDraw.cs
@@ -624,7 +624,7 @@ public class DebugDraw
 
     public static int DuDarkenCol(int col)
     {
-        return (int)(((col >> 1) & 0x007f7f7f) | (col & 0xff000000));
+        return (int)((uint)((col >> 1) & 0x007f7f7f) | (col & 0xff000000));
     }
 
 
diff --git a/src/DotRecast.Recast.Toolset/Tools/RcObstacleTool.cs b/src/DotRecast.Recast.Toolset/Tools/RcObstacleTool.cs
index 5931f74..ec0e06d 100644
--- a/src/DotRecast.Recast.Toolset/Tools/RcObstacleTool.cs
+++ b/src/DotRecast.Recast.Toolset/Tools/RcObstacleTool.cs
@@ -30,8 +30,6 @@ namespace DotRecast.Recast.Toolset.Tools
 
         public NavMeshBuildResult Build(IInputGeomProvider geom, RcNavMeshBuildSettings setting, RcByteOrder order, bool cCompatibility)
         {
-            DtStatus status;
-
             if (null == geom || null == geom.GetMesh())
             {
                 //m_ctx->log(RC_LOG_ERROR, "buildTiledNavigation: No vertices and triangles.");