diff --git a/sen2chain/multi_processing.py b/sen2chain/multi_processing.py
index 8e441c8236f73f3cbb236ae1d4d54e189da38dda..970f59b1d90306976613dd7b6c2c8956096f071f 100644
--- a/sen2chain/multi_processing.py
+++ b/sen2chain/multi_processing.py
@@ -1,7 +1,7 @@
 # coding: utf-8
 
 import multiprocessing, subprocess
-import os
+import os, signal
 import time
 import logging
 from functools import partial