diff --git a/CAL/CalibrationProcessing/bin/holography_process.py b/CAL/CalibrationProcessing/bin/holography_process.py
index 2bb5c146403d4cf030f08f7eeda4467bc4e4b2ad..529b22beb68457a7a1d86e59dd8cca3e0ba868a2 100644
--- a/CAL/CalibrationProcessing/bin/holography_process.py
+++ b/CAL/CalibrationProcessing/bin/holography_process.py
@@ -31,7 +31,7 @@ def log_step_execution(step_description):
                 logger.exception('exception occurred performing step %s: %s',
                                  step_description, e)
                 if isinstance(input, datacontainers.HolographyDataset):
-                    store_step(input, FAIL_SAVE_STORAGE_PATH + 'ERROR-%s.hdf5' % input.target_station_name)
+                    store_step(input, os.path.join(FAIL_SAVE_STORAGE_PATH, 'ERROR-%s.hdf5' % input.target_station_name))
                 sys.exit(1)
 
         return wrapper