diff --git a/module3/exo1/analyse-syndrome-grippal.ipynb b/module3/exo1/analyse-syndrome-grippal.ipynb
index e955fea66055878847ed0f4a6d8b3516093ee193..95398283e30d00f3b84ab72afe1c9e389e0b6b82 100644
--- a/module3/exo1/analyse-syndrome-grippal.ipynb
+++ b/module3/exo1/analyse-syndrome-grippal.ipynb
@@ -90,7 +90,7 @@
     "data_url = \"http://www.sentiweb.fr/datasets/incidence-PAY-3.csv\"\n",
     "local_file = 'incidence-PAY-3.csv'\n",
     "\n",
-    "if ~os.path.exists(local_file):\n",
+    "if not os.path.exists(local_file):\n",
     "    download_data = pd.read_csv(data_url, skiprows=1)\n",
     "    download_data.to_csv(local_file)\n",
     "\n"