diff --git a/xos/synchronizer/event_steps/test_onu_events.py b/xos/synchronizer/event_steps/test_onu_events.py
index 0bd1c31..c11812f 100644
--- a/xos/synchronizer/event_steps/test_onu_events.py
+++ b/xos/synchronizer/event_steps/test_onu_events.py
@@ -131,5 +131,5 @@
             
 
 if __name__ == '__main__':
-    sys.path.append("..")  # for import of helpers.py
+    sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)), ".."))  # for import of helpers.py
     unittest.main()