Index: modules/book/book.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/book/book.module,v
retrieving revision 1.464
diff -u -p -r1.464 book.module
--- modules/book/book.module	15 May 2008 21:19:24 -0000	1.464
+++ modules/book/book.module	16 Jun 2008 06:45:03 -0000
@@ -301,13 +301,13 @@ function book_form_alter(&$form, $form_s
 
     $access = user_access('administer book outlines');
     if (!$access) {
-      if (user_access('add content to books') && ((!empty($node->book['mlid']) && !empty($node->nid)) || book_type_is_allowed($node->type))) {
+      if (user_access('add content to books') && (!empty($node->book['mlid']) && !empty($node->nid))) {
         // Already in the book hierarchy, or this node type is allowed.
         $access = TRUE;
       }
     }
 
-    if ($access) {
+    if ($access && book_type_is_allowed($node->type)) {
       _book_add_form_elements($form, $node);
       $form['book']['pick-book'] = array(
         '#type' => 'submit',