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-rw-r--r--modules/book/book.install4
1 files changed, 4 insertions, 0 deletions
diff --git a/modules/book/book.install b/modules/book/book.install
index 1bd094c23..e92aca6e4 100644
--- a/modules/book/book.install
+++ b/modules/book/book.install
@@ -17,6 +17,10 @@ function book_install() {
* Implements hook_uninstall().
*/
function book_uninstall() {
+ variable_del('book_allowed_types');
+ variable_del('book_child_type');
+ variable_del('book_block_mode');
+
// Delete menu links.
db_delete('menu_links')
->condition('module', 'book')