diff --git a/src/timer.rs b/src/timer.rs
index 5f29825..0972f87 100644
--- a/src/timer.rs
+++ b/src/timer.rs
@@ -129,7 +129,7 @@ impl Timer {
         t.borrow_mut().cb = Some(*cb);
         t.borrow_mut().timer_type = timer_type;
         t.borrow_mut().expire_time = expire_time;
-        t.borrow_mut().expires = expire_time as i64;
+        t.borrow_mut().expires = (self.get_tick_count)() + expire_time as i64;
         return Rc::downgrade(&t.borrow().wp);
     }