diff --git a/CAL/CalibrationCommon/test/t_holography_observation.py b/CAL/CalibrationCommon/test/t_holography_observation.py
index 26ca983973dffd411787ece1dcf02ffe39eec946..a43b2a8200feb0a76f3c56df537ca24bff2722a4 100755
--- a/CAL/CalibrationCommon/test/t_holography_observation.py
+++ b/CAL/CalibrationCommon/test/t_holography_observation.py
@@ -18,8 +18,9 @@ class TestHolographyDatasetClass(unittest.TestCase):
         self.assertEqual(HolographyObservation_freq_one.start_mjd, 5038710120.0)
         self.assertEqual(HolographyObservation_freq_one.end_mjd, 5038710149.540695)
         self.assertAlmostEqual((HolographyObservation_freq_one.end_datetime -
-                         HolographyObservation_freq_one.start_datetime).seconds,
+                                HolographyObservation_freq_one.start_datetime).seconds,
                                29)
 
+
 if __name__ == '__main__':
-    unittest.main()
\ No newline at end of file
+    unittest.main()