diff --git a/scripts/prepare_network.py b/scripts/prepare_network.py
index 9d53625c..03187284 100755
--- a/scripts/prepare_network.py
+++ b/scripts/prepare_network.py
@@ -225,7 +225,8 @@ if __name__ == "__main__":
     for o in opts:
         m = re.match(r'^\d+seg$', o, re.IGNORECASE)
         if m is not None:
-            n = apply_time_segmentation(n, m.group(0)[:-3], solver_name=snakemake.config["solving"]["solver"]["name"])
+            solver_name = snakemake.config["solving"]["solver"]["name"]
+            n = apply_time_segmentation(n, m.group(0)[:-3], solver_name=solver_name)
             break
 
     for o in opts: