diff --git a/clean/02_production.ipynb b/clean/02_production.ipynb
index 1360879..a7586b7 100644
--- a/clean/02_production.ipynb
+++ b/clean/02_production.ipynb
@@ -121,6 +121,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "import os\n",
     "key = os.environ.get('AZURE_SEARCH_KEY', 'XXX')"
    ]
   },