diff --git a/wp-content/themes/twentyten/header.php b/wp-content/themes/twentyten/header.php
index 304af9cad1..2c44e8d01b 100644
--- a/wp-content/themes/twentyten/header.php
+++ b/wp-content/themes/twentyten/header.php
@@ -72,7 +72,7 @@
 							( /* $src, $width, $height */ $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'post-thumbnail' ) ) &&
 							$image[1] >= HEADER_IMAGE_WIDTH ) :
 						// Houston, we have a new header image!
-						echo get_the_post_thumbnail( $post->ID, 'post-thumbnail' );
+						echo get_the_post_thumbnail( $post->ID );
 					elseif ( get_header_image() ) : ?>
 						<img src="<?php header_image(); ?>" width="<?php echo HEADER_IMAGE_WIDTH; ?>" height="<?php echo HEADER_IMAGE_HEIGHT; ?>" alt="" />
 					<?php endif; ?>