Index: wp-includes/comment.php
===================================================================
--- wp-includes/comment.php	(revision 39949)
+++ wp-includes/comment.php	(working copy)
@@ -3005,9 +3005,13 @@
 		 * @param int $comment_post_ID Post ID.
 		 */
 		do_action( 'comment_on_draft', $comment_post_ID );
+		
+		if ( current_user_can( 'read_post', $comment_post_ID ) ) {
+			return new WP_Error( 'comment_on_draft', __( 'Sorry, comments are not allowed for this item.' ), 403 );
+		} else {
+			return new WP_Error( 'comment_on_draft' );
+		}
 
-		return new WP_Error( 'comment_on_draft' );
-
 	} elseif ( post_password_required( $comment_post_ID ) ) {
 
 		/**