diff --git a/src/format/format-factur-x.service.ts b/src/format/format-factur-x.service.ts
index 5b3c63a..b44d579 100644
--- a/src/format/format-factur-x.service.ts
+++ b/src/format/format-factur-x.service.ts
@@ -1,5 +1,6 @@
 import { Textdomain } from '@esgettext/runtime';
 import { Injectable } from '@nestjs/common';
+import crypto from 'crypto';
 import {
 	AFRelationship,
 	PDFArray,