commit 9e9baa089cae1cbb419ba8290653a8e3b9d3311a
Author: Lee Rowlands <lee.rowlands@previousnext.com.au>
Date:   Sat Aug 24 07:00:32 2013 +1000

    try without load of options

diff --git a/core/modules/forum/forum.install b/core/modules/forum/forum.install
index 267f014..488e7e9 100644
--- a/core/modules/forum/forum.install
+++ b/core/modules/forum/forum.install
@@ -133,9 +133,6 @@ function forum_uninstall() {
     $field->delete();
   }
 
-  // Load the dependent Options module, in case it has been disabled.
-  drupal_load('module', 'options');
-
   if ($field = field_info_field('forum_container')) {
     $field->delete();
   }