diff --git a/wario/utils.ipynb b/wario/utils.ipynb
index 17d6058bfe1c135a17f1e9ff95d93071ab2f7533..993c6d6047ca7330c73459add52b718667164bb2 100644
--- a/wario/utils.ipynb
+++ b/wario/utils.ipynb
@@ -322,7 +322,7 @@
     "        \n",
     "        # Save pdb folder\n",
     "        for j in selected_conf:\n",
-    "            traj = md.load_pdb(\"/\".join([\"/\".join([var_dict[\"ensemble_path\"],var_dict[\"folders\"][0]]),j]))\n",
+    "            traj = md.load_pdb(\"/\".join([\"/\".join([var_dict[\"ensemble_path\"],var_dict[\"folders\"][0]]),str(j)]))\n",
     "            traj.save_pdb(\"/\".join([save_files, \"\".join([ensemble_name,'_',str(j),'.pdb'])]))\n",
     "\n",
     "    print(\"\\nFiles saved.\\n\")    "