diff --git a/notebooks/structures.ipynb b/notebooks/structures.ipynb
index 710e6b4b7..a2239e971 100644
--- a/notebooks/structures.ipynb
+++ b/notebooks/structures.ipynb
@@ -38,7 +38,7 @@
    "outputs": [],
    "source": [
     "import aiidalab_widgets_base as awb\n",
-    "import weas_widget\n"
+    "import weas_widget"
    ]
   },
   {
@@ -73,6 +73,7 @@
     "        awb.BasicStructureEditor(title=\"Basic Editor\"),\n",
     "        awb.BasicCellEditor(title=\"Basic Cell Editor\"),\n",
     "    ],\n",
+    "    viewer=viewer,\n",
     ")\n",
     "# widget = StructureUploadWidget()\n",
     "# Enforce node format to be CifData:\n",