diff --git a/platypush/plugins/serial/__init__.py b/platypush/plugins/serial/__init__.py
index 04a365729..201e4009f 100644
--- a/platypush/plugins/serial/__init__.py
+++ b/platypush/plugins/serial/__init__.py
@@ -1,4 +1,5 @@
 import json
+import serial
 
 from platypush.message.response import Response