diff --git a/examples/jsm/postprocessing/EffectComposer.js b/examples/jsm/postprocessing/EffectComposer.js
index 6bf3a460dad9b7c98f16a88158b95dc0e6e02f54..a5e833c6e0e684fcf2ba0b485acbda3c948f6fd5 100644
--- a/examples/jsm/postprocessing/EffectComposer.js
+++ b/examples/jsm/postprocessing/EffectComposer.js
@@ -90,9 +90,7 @@ Object.assign( EffectComposer.prototype, {
 	addPass: function ( pass ) {
 
 		this.passes.push( pass );
-
-		var size = this.renderer.getDrawingBufferSize( new Vector2() );
-		pass.setSize( size.width, size.height );
+		pass.setSize( this._width * this._pixelRatio, this._height * this._pixelRatio );
 
 	},