diff --git a/src/EcoFOCIpy/io/wetlabs_parser.py b/src/EcoFOCIpy/io/wetlabs_parser.py
index fdaa22c..5297e69 100644
--- a/src/EcoFOCIpy/io/wetlabs_parser.py
+++ b/src/EcoFOCIpy/io/wetlabs_parser.py
@@ -12,6 +12,7 @@
 
 """
 import datetime
+import sys
 
 import pandas as pd