diff --git a/modules/book/book.admin.inc b/modules/book/book.admin.inc
index 43607dc..cfd7d67 100644
--- a/modules/book/book.admin.inc
+++ b/modules/book/book.admin.inc
@@ -237,6 +237,9 @@ function theme_book_admin_table($form) {
     $form[$key]['mlid']['#attributes']['class'] = 'book-mlid';
     $form[$key]['weight']['#attributes']['class'] = 'book-weight';
 
+    // Disable editing book title.
+    $form[$key]['title']['#attributes']['readonly'] = 'readonly';
+
     $data = array(
       theme('indentation', $form[$key]['depth']['#value'] - 2) . drupal_render($form[$key]['title']),
       drupal_render($form[$key]['weight']),