diff --git a/scripts/upgrade b/scripts/upgrade
index ef16638..0f4b404 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -68,6 +68,13 @@ if [ -z "$final_path" ]; then
 	ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 fi
 
+# If secret_key doesn't exist, create it
+if [[ -z "$secret_key" ]]; then
+	secret_key=$(ynh_string_random --length=50)
+	ynh_app_setting_set --app=$app --key=secret_key --value=$secret_key
+fi
+
+
 # Cleaning legacy permissions
 if ynh_legacy_permissions_exists; then
 	ynh_legacy_permissions_delete_all