diff --git a/Optimization of control rules/Optimization_control_rules.ipynb b/Optimization of control rules/Optimization_control_rules.ipynb
index 4216078769bfca7a5ab9bd8777e7a7865cffb882..fd42876b5306feac8aabcd1ac8ad86b0228cf788 100644
--- a/Optimization of control rules/Optimization_control_rules.ipynb	
+++ b/Optimization of control rules/Optimization_control_rules.ipynb	
@@ -288,7 +288,7 @@
    "outputs": [],
    "source": [
     "structures = file_to_df(temp_folder / structure_xlsx)\n",
-    "structures_list = structures.tolist()\n",
+    "structures_list = structures['structures'].tolist()\n",
     "structures_list"
    ]
   },