diff --git a/bindings/python/examples/using_the_visualizer.ipynb b/bindings/python/examples/using_the_visualizer.ipynb
index 2840d2e07..43d43c143 100644
--- a/bindings/python/examples/using_the_visualizer.ipynb
+++ b/bindings/python/examples/using_the_visualizer.ipynb
@@ -563,7 +563,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "converter = lambda funny: Annotation(start=funny['startPlace'], end=funny['endPlace'], label=funny['theTag'])\n",
+    "def converter(funny):\n",
+    "    return Annotation(start=funny[\"startPlace\"], end=funny[\"endPlace\"], label=funny[\"theTag\"])\n",
     "visualizer = EncodingVisualizer(tokenizer=tokenizer, default_to_notebook=True, annotation_converter=converter)"
    ]
   },