diff --git a/src/timer.rs b/src/timer.rs
index cc87d16..053f1aa 100644
--- a/src/timer.rs
+++ b/src/timer.rs
@@ -336,6 +336,12 @@ impl Timer {
                     None => {
                     }
                 }
+                if Rc::weak_count(&v.borrow().wp) > 0 {
+                    v.borrow_mut().wp = Rc::new(v.borrow().holder.clone());
+                }
+                crate::ListHead::add_tail(&self.free_timer_list,
+                                          &v.borrow_mut().timer_entry);
+                self.free_timer_num += 1;
             }
             None => {
             }