diff --git a/scripts/upgrade b/scripts/upgrade
index 186a0bd..32c7001 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -129,10 +129,10 @@ exec_occ() {
 # Define a function to add an external storage
 # Create the external storage for the given folders and enable sharing
 create_external_storage() {
-local datadir="$1"
+local mount_dir="$1"
 local mount_name="$2"
 local mount_id=$(exec_occ files_external:create --output=json \
-    "$mount_name" 'local' 'null::null' -c "datadir=$data_dir/data" || true)
+    "$mount_name" 'local' 'null::null' -c "datadir=$mount_dir" || true)
 ! [[ $mount_id =~ ^[0-9]+$ ]] \
     && ynh_print_warn --message="Unable to create external storage" \
     || exec_occ files_external:option "$mount_id" enable_sharing true