diff --git a/functions/utility.py b/functions/utility.py
index 03da98f72ceda742388a56c0c5321e21c0468d22..ea5afb0d60bbe26047be92b1393b7711b304ce2e 100644
--- a/functions/utility.py
+++ b/functions/utility.py
@@ -1,7 +1,8 @@
 import numpy as np
 import matplotlib.pyplot as plt
 import h5py as h5
-from typing import Union, List, Tuple
+import os
+from typing import List, Tuple
 
 
 def plot_temp_over_time(