diff --git a/examples/js/postprocessing/OutlinePass.js b/examples/js/postprocessing/OutlinePass.js
index 8c9fd452c7de3727ff2bc6a4f7b960a6acc36cad..84d93a730a0780a67b59aa4948ce6aa5c92aa33d 100644
--- a/examples/js/postprocessing/OutlinePass.js
+++ b/examples/js/postprocessing/OutlinePass.js
@@ -510,18 +510,18 @@ THREE.OutlinePass.prototype = Object.assign( Object.create( THREE.Pass.prototype
 				void main() {\
 					vec2 invSize = 1.0 / texSize;\
 					float weightSum = gaussianPdf(0.0, kernelRadius);\
-					vec3 diffuseSum = texture2D( colorTexture, vUv).rgb * weightSum;\
+					vec4 diffuseSum = texture2D( colorTexture, vUv) * weightSum;\
 					vec2 delta = direction * invSize * kernelRadius/float(MAX_RADIUS);\
 					vec2 uvOffset = delta;\
 					for( int i = 1; i <= MAX_RADIUS; i ++ ) {\
 						float w = gaussianPdf(uvOffset.x, kernelRadius);\
-						vec3 sample1 = texture2D( colorTexture, vUv + uvOffset).rgb;\
-						vec3 sample2 = texture2D( colorTexture, vUv - uvOffset).rgb;\
+						vec4 sample1 = texture2D( colorTexture, vUv + uvOffset);\
+						vec4 sample2 = texture2D( colorTexture, vUv - uvOffset);\
 						diffuseSum += ((sample1 + sample2) * w);\
 						weightSum += (2.0 * w);\
 						uvOffset += delta;\
 					}\
-					gl_FragColor = vec4(diffuseSum/weightSum, 1.0);\
+					gl_FragColor = diffuseSum/weightSum;\
 				}"
 		} );