diff --git a/plio/io/isis_serial_number.py b/plio/io/isis_serial_number.py
index 0a3bc0a405136d3941545c2047d4773d541d0aff..faba3bf52d9cd7b4b7e6293969f2199e61bb933e 100644
--- a/plio/io/isis_serial_number.py
+++ b/plio/io/isis_serial_number.py
@@ -8,7 +8,6 @@ import plio
 from plio.data import get_data
 from plio.io.io_db import Translations, StringToMission, setup_db_session
 from plio.utils.utils import find_in_dict, find_nested_in_dict
-from datetime import datetime
 
 
 def get_isis_translation(label):