diff --git a/examples/How_to_call_functions_for_knowledge_retrieval.ipynb b/examples/How_to_call_functions_for_knowledge_retrieval.ipynb
index 3b8e118753..bfb1a29d37 100644
--- a/examples/How_to_call_functions_for_knowledge_retrieval.ipynb
+++ b/examples/How_to_call_functions_for_knowledge_retrieval.ipynb
@@ -54,7 +54,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import os\n",
     "import arxiv\n",
     "import ast\n",
     "import concurrent\n",