diff --git a/reference/image/functions/imagecolorset.xml b/reference/image/functions/imagecolorset.xml
index d2eb63e697..8382e66141 100644
--- a/reference/image/functions/imagecolorset.xml
+++ b/reference/image/functions/imagecolorset.xml
@@ -89,7 +89,7 @@ $bg = imagecolorat($im, 0, 0);
 imagecolorset($im, $bg, 0, 0, 255);
 
 // Output the image to the browser
-//header('Content-type: image/png');
+header('Content-type: image/png');
 
 imagepng($im);
 imagedestroy($im);