diff --git a/rules/retrieve.smk b/rules/retrieve.smk
index da2dc40a..05bbefd8 100644
--- a/rules/retrieve.smk
+++ b/rules/retrieve.smk
@@ -191,7 +191,7 @@ if config["enable"]["retrieve"]:
         input:
             HTTP.remote(
                 "data.open-power-system-data.org/time_series/{version}/time_series_60min_singleindex.csv".format(
-                version="2019-06-05"
+                    version="2019-06-05"
                     if config["snapshots"]["end"] < "2019"
                     else "2020-10-06"
                 ),