diff --git a/src/utils/mrz.ts b/src/utils/mrz.ts
index 3a0faaa5..c300aab2 100644
--- a/src/utils/mrz.ts
+++ b/src/utils/mrz.ts
@@ -129,9 +129,10 @@ function mrzCleanResult(obj: Record<string, string>) {
       .trim();
   });
 
+  const original = structuredClone(obj);
   for (const value of Object.values(DEFAULT_FIELD)) {
     if (obj[value.field] && 'format' in value) {
-      obj[value.field] = value.format(obj[value.field], obj);
+      obj[value.field] = value.format(obj[value.field], original);
     }
   }