diff --git a/install.sh b/install.sh
index 9f5a4d1..9d70435 100755
--- a/install.sh
+++ b/install.sh
@@ -36,7 +36,7 @@ if [[ "$USER" == "pi" ]]; then ## PROPOSE QR_CODE PRINTER
 fi
 # python3 -m pip install -U silkaj
 ## python -> python3 link
-ln -f -s  /usr/bin/python3 /usr/bin/python
+sudo ln -f -s  /usr/bin/python3 /usr/bin/python
 ## GIVE ACCESS TO www-data group
 sudo usermod -aG www-data $USER