diff --git a/scripts/upgrade b/scripts/upgrade
index b98017a..73810ca 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -78,7 +78,7 @@ fi
 
 if [ -z "$hashed_password" ]; then
 	# Generate random password
-	password=$(ynh_string_random --length=8)
+	password=$(ynh_string_random 8)
 	hashed_password=$(echo -n $password | sha256sum | cut -d' ' -f1)
 
 	echo "The new version of LSTU provide an admin and a stats area which required a password.