diff --git a/modules/book.module b/modules/book.module
index 60ec8cc151807c37a07a58ae46e73c1b1543b18b..9a0c736285bf470529920c6778ab6a469330f1bf 100644
--- a/modules/book.module
+++ b/modules/book.module
@@ -614,7 +614,7 @@ function book_tree($parent = 0, $depth = 3, $unfold = array()) {
   }
 
   if ($tree = book_tree_recurse($parent, $depth, $children, $unfold)) {
-    return '<div class="menu"><ul>'. $tree .'</ul></div>';
+    return '<ul class="menu">'. $tree .'</ul>';
   }
 }
 
diff --git a/modules/book/book.module b/modules/book/book.module
index 60ec8cc151807c37a07a58ae46e73c1b1543b18b..9a0c736285bf470529920c6778ab6a469330f1bf 100644
--- a/modules/book/book.module
+++ b/modules/book/book.module
@@ -614,7 +614,7 @@ function book_tree($parent = 0, $depth = 3, $unfold = array()) {
   }
 
   if ($tree = book_tree_recurse($parent, $depth, $children, $unfold)) {
-    return '<div class="menu"><ul>'. $tree .'</ul></div>';
+    return '<ul class="menu">'. $tree .'</ul>';
   }
 }