diff --git a/examples/jsm/postprocessing/OutlinePass.js b/examples/jsm/postprocessing/OutlinePass.js
index e5515e73a479e84d9c993b167ff4de9cd7159db4..7f909b5195e34d1a32994509ece1b6d369278c23 100644
--- a/examples/jsm/postprocessing/OutlinePass.js
+++ b/examples/jsm/postprocessing/OutlinePass.js
@@ -530,18 +530,18 @@ OutlinePass.prototype = Object.assign( Object.create( 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;\
 				}"
 		} );