diff --git a/observatory_platform/tests/test_date_utils.py b/observatory_platform/tests/test_date_utils.py
index 031d7b0b2..16b5d539e 100644
--- a/observatory_platform/tests/test_date_utils.py
+++ b/observatory_platform/tests/test_date_utils.py
@@ -81,7 +81,7 @@ def test_pendulum_inputs(self):
 
     def test_missing_tz(self):
         inputs = ["2024-01-01 00:00:00", "2024-01-01T12:00:00", datetime(2024, 1, 1, 12, 0, 0), pendulum.datetime(2024, 1, 1, 12, 0, 0)]
-        expected_outputs = ["2024-01-01T00:00:00+00:00", "2024-01-01T12:00:00+00:00", "2024-01-01T12:00:00+00:00"]
+        expected_outputs = ["2024-01-01T00:00:00+00:00", "2024-01-01T12:00:00+00:00", "2024-01-01T12:00:00+00:00", "2024-01-01T12:00:00+00:00"]
         for input, expected_output in zip(inputs, expected_outputs):
             actual_output = datetime_normalise(input)
             self.assertEqual(expected_output, actual_output)