Index: src/wp-admin/includes/meta-boxes.php
===================================================================
--- src/wp-admin/includes/meta-boxes.php	(revision 54945)
+++ src/wp-admin/includes/meta-boxes.php	(working copy)
@@ -888,7 +888,7 @@
 	/** This filter is documented in wp-admin/edit-tag-form.php */
 	$editable_slug = apply_filters( 'editable_slug', $post->post_name, $post );
 	?>
-<label class="screen-reader-text" for="post_name"><?php _e( 'Slug' ); ?></label><input name="post_name" type="text" size="13" id="post_name" value="<?php echo esc_attr( $editable_slug ); ?>" />
+<label class="screen-reader-text" for="post_name"><?php _e( 'Slug' ); ?></label><input name="post_name" type="text" class="large-text" size="13" id="post_name" value="<?php echo esc_attr( $editable_slug ); ?>" />
 	<?php
 }