diff --git a/examples/jsm/postprocessing/RenderPass.js b/examples/jsm/postprocessing/RenderPass.js
index a6c3804ec67b90..c60e92d333501e 100644
--- a/examples/jsm/postprocessing/RenderPass.js
+++ b/examples/jsm/postprocessing/RenderPass.js
@@ -42,7 +42,7 @@ class RenderPass extends Pass {
 		if ( this.clearColor !== null ) {
 
 			renderer.getClearColor( this._oldClearColor );
-			renderer.setClearColor( this.clearColor );
+			renderer.setClearColor( this.clearColor, renderer.getClearAlpha() );
 
 		}