diff --git a/core-modules/005QubesNetVm.py b/core-modules/005QubesNetVm.py
index 5ed96ebe..42789f63 100644
--- a/core-modules/005QubesNetVm.py
+++ b/core-modules/005QubesNetVm.py
@@ -20,6 +20,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #
 #
+import sys
 
 from qubes.qubes import QubesVm,register_qubes_vm_class,xs,dry_run
 from qubes.qubes import defaults,system_path,vm_files