How to remove search box from Twenty Eleven Theme

I’m using the Twenty Eleven theme and I have removed the header image, however now I have two search boxes very close to each other. One is in the header (where the name of the website is) and the other one is on the top of the right side bar. How do I remove the one in the header? I’ve tried removing <?php include (TEMPLATEPATH . ‘/searchform.php’); ?> from the header.php but the search box is still there. Please help.