diff --git a/src/listhead.rs b/src/listhead.rs
index 7c3711a..69e17e5 100644
--- a/src/listhead.rs
+++ b/src/listhead.rs
@@ -42,6 +42,7 @@ impl<T> ListHead<T> {
     pub fn del_init(&mut self) {
         self.next.upgrade().unwrap().borrow_mut().prev = self.prev.clone();
         self.prev.upgrade().unwrap().borrow_mut().next = self.next.clone();
+        self.init();
     }
 
     pub fn empty(&self) -> bool {
@@ -70,6 +71,7 @@ impl<T> ListHead<T> {
         pnew.borrow_mut().next = head.borrow_mut().next.clone();
         pnew.borrow_mut().next.upgrade().unwrap().borrow_mut().prev = Rc::downgrade(pnew);
         pnew.borrow_mut().prev = head.borrow_mut().prev.clone();
+        head.borrow_mut().init();
     }
 
 }