diff --git a/platypush/backend/pushbullet/listener.py b/platypush/backend/pushbullet/listener.py
index 218a5045e..e847d17e9 100644
--- a/platypush/backend/pushbullet/listener.py
+++ b/platypush/backend/pushbullet/listener.py
@@ -1,3 +1,4 @@
+import time
 from typing import Callable, Optional
 
 from pushbullet import Listener as _Listener