diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index ebf2ee71..2a92b670 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -1931,7 +1931,7 @@ def maybe_adjust_costs_and_potentials(n, opts):
             else:
                 if attr == 'p_nom_max':
                     comps = {"Generator", "Link", "StorageUnit"}
-                elif attr = 'e_nom_max':
+                elif attr == 'e_nom_max':
                     comps = {"Store"}    
                 else:
                     comps = {"Generator", "Link", "StorageUnit", "Store"}