diff --git a/CEP/Pipeline/framework/lofarpipe/support/subprocessgroup.py b/CEP/Pipeline/framework/lofarpipe/support/subprocessgroup.py
index b0f3f978fee20166ca65edf364c3ee4727010e96..27df5a47390d382f9ea86b0f550f2e1f97cff6a0 100644
--- a/CEP/Pipeline/framework/lofarpipe/support/subprocessgroup.py
+++ b/CEP/Pipeline/framework/lofarpipe/support/subprocessgroup.py
@@ -1,5 +1,6 @@
 import select
 import os
+import sys
 import signal
 import fcntl
 import time