diff --git a/python/ctem/ctem/driver.py b/python/ctem/ctem/driver.py
index dd5ae9e0..63deb939 100644
--- a/python/ctem/ctem/driver.py
+++ b/python/ctem/ctem/driver.py
@@ -5,6 +5,8 @@
 from ctem import util
 import sys
 from ctem import __file__ as _pyfile
+from pathlib import Path
+import warnings
 
 class Simulation:
     """