diff --git a/Snakefile b/Snakefile
index 46492242f..a7b9eb070 100644
--- a/Snakefile
+++ b/Snakefile
@@ -57,9 +57,7 @@ RESDIR = config["results_dir"].strip("/") + f"/{SECDIR}"
 load_data_paths = get_load_paths_gegis("data", config)
 
 if config["enable"].get("retrieve_cost_data", True):
-    COSTS = (
-        "resources/" + RDIR + f"costs_{config["costs"]["year"]}.csv"
-    )
+    COSTS = "resources/" + RDIR + f"costs_{config["costs"]["year"]}.csv"
 else:
     COSTS = "data/costs.csv"
 ATLITE_NPROCESSES = config["atlite"].get("nprocesses", 4)
@@ -394,7 +392,7 @@ if config["enable"].get("retrieve_cost_data", True):
 
     rule retrieve_cost_data:
         params:
-            version=config['costs']['version'],
+            version=config["costs"]["version"],
         input:
             HTTP.remote(
                 "raw.githubusercontent.com/PyPSA/technology-data/{params.version}/outputs/costs_{year}.csv",