diff --git a/modules/forum/forum.install b/modules/forum/forum.install
index 066b476..b5817ab 100644
--- a/modules/forum/forum.install
+++ b/modules/forum/forum.install
@@ -59,8 +59,6 @@ function forum_enable() {
     );
     field_create_field($field);
 
-    variable_set('forum_nav_vocabulary', $vocabulary->vid);
-
     // Create a default forum so forum posts can be created.
     $edit = array(
       'name' => t('General discussion'),
@@ -239,5 +237,5 @@ function forum_schema() {
  * Implements hook_update_last_removed().
  */
 function forum_update_last_removed() {
-  return 7002;
+  return 7003;
 }