diff --git a/src/DotRecast.Recast.Demo/Tools/ObstacleSampleTool.cs b/src/DotRecast.Recast.Demo/Tools/ObstacleSampleTool.cs
index e38688f..216f7f3 100644
--- a/src/DotRecast.Recast.Demo/Tools/ObstacleSampleTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/ObstacleSampleTool.cs
@@ -33,7 +33,6 @@ public class ObstacleSampleTool : ISampleTool
             if (buildResult.Success)
             {
                 _sample.Update(_sample.GetInputGeom(), buildResult.RecastBuilderResults, buildResult.NavMesh);
-                _sample.SetChanged(false);
             }
         }