diff --git a/rdtools/analysis_chains.py b/rdtools/analysis_chains.py
index 6208e1e2..ce08c137 100644
--- a/rdtools/analysis_chains.py
+++ b/rdtools/analysis_chains.py
@@ -539,7 +539,6 @@ def _call_clearsky_filter(filter_string):
                 "sensor_clearsky_filter"
             )
 
-
         # note: the previous implementation using the & operator treated NaN
         # filter values as False, so we do the same here for consistency:
         filter_components = pd.DataFrame(filter_components).fillna(False)