diff --git a/opendm/system.py b/opendm/system.py
index 24ee385a..6f23d8a4 100644
--- a/opendm/system.py
+++ b/opendm/system.py
@@ -3,6 +3,7 @@ import errno
 import json
 import datetime
 import sys
+import subprocess
 
 from opendm import context
 from opendm import log