diff --git a/scripts/prepare_perfect_foresight.py b/scripts/prepare_perfect_foresight.py
index fbc17a52..8df05cee 100644
--- a/scripts/prepare_perfect_foresight.py
+++ b/scripts/prepare_perfect_foresight.py
@@ -18,10 +18,10 @@ from _helpers import (
     update_config_from_wildcards,
 )
 from add_existing_baseyear import add_build_year_to_new_assets
+from prepare_sector_network import adjust_transport_temporal_agg
 from pypsa.descriptors import expand_series
 from pypsa.io import import_components_from_dataframe
 from six import iterkeys
-from prepare_sector_network import adjust_transport_temporal_agg
 
 logger = logging.getLogger(__name__)
 
@@ -522,7 +522,7 @@ if __name__ == "__main__":
     if isinstance(segments, (int, float)):
         n = apply_time_segmentation_perfect(n, segments, solver_name=solver_name)
         adjust_transport_temporal_agg(n)
-        
+
     # adjust global constraints lv limit if the same for all years
     n = adjust_lvlimit(n)
     # adjust global constraints CO2 limit