diff --git a/Sources/Filters/General/ClipClosedSurface/example/index.js b/Sources/Filters/General/ClipClosedSurface/example/index.js
index 29499dd70a2..e2e96275ddc 100644
--- a/Sources/Filters/General/ClipClosedSurface/example/index.js
+++ b/Sources/Filters/General/ClipClosedSurface/example/index.js
@@ -35,6 +35,7 @@ const actor = vtkActor.newInstance();
 renderer.addActor(actor);
 
 const mapper = vtkMapper.newInstance({ interpolateScalarBeforeMapping: true });
+mapper.setColorModeToDirectScalars();
 actor.setMapper(mapper);
 
 const cam = vtkCamera.newInstance();