diff --git a/sketch.go b/sketch.go
index 7de9540..07afa73 100644
--- a/sketch.go
+++ b/sketch.go
@@ -128,6 +128,7 @@ func (s *Sketch) Draw(ctx *RenderCtx) {
 	viewport := s.CalcViewport(ctx)
 
 	rl.BeginTextureMode(s.composite)
+	rl.ClearBackground(rl.NewColor(0, 0, 0, 0))
 	for _, instance := range s.layerToolsOrdered {
 		config := instance.config
 		if config.visible {