diff --git a/src/extras/ImageUtils.js b/src/extras/ImageUtils.js
index 1ecd715ab2dc8ba39aee02a0e1e8e24b04a693e6..670613001dd6fe40aa41592ccc9f6a29fda289b0 100644
--- a/src/extras/ImageUtils.js
+++ b/src/extras/ImageUtils.js
@@ -134,7 +134,7 @@ THREE.ImageUtils = {
 				var idx = ( y * width + x ) * 4;
 
 				output[ idx ] = ( ( normal[ 0 ] + 1.0 ) / 2.0 * 255 ) | 0;
-				output[ idx + 1 ] = ( ( normal[ 1 ] + 1.0 / 2.0 ) * 255 ) | 0;
+				output[ idx + 1 ] = ( ( normal[ 1 ] + 1.0 ) / 2.0 * 255 ) | 0;
 				output[ idx + 2 ] = ( normal[ 2 ] * 255 ) | 0;
 				output[ idx + 3 ] = 255;