diff --git a/src/dpe-sanitizer.service.js b/src/dpe-sanitizer.service.js
index ed16983..7567624 100644
--- a/src/dpe-sanitizer.service.js
+++ b/src/dpe-sanitizer.service.js
@@ -53,7 +53,7 @@ export default class DpeSanitizerService {
         }
 
         if (this.#isEnum(key)) {
-          return val;
+          return val?.toString();
         }
 
         if (this.#isUndefinedVal(val)) {
diff --git a/src/engine.js b/src/engine.js
index d748589..9118df8 100644
--- a/src/engine.js
+++ b/src/engine.js
@@ -19,6 +19,8 @@ import {
   collectionCanBeEmpty,
   containsAnySubstring,
   isEffetJoule,
+  use_enum_as_string,
+  useEnumAsString,
   xmlParser
 } from './utils.js';
 import { Inertie } from './7_inertie.js';
@@ -66,7 +68,15 @@ export function calcul_3cl_xml(dpeXmlContent, options) {
  */
 export function calcul_3cl(inputDpe, options) {
   if (!options) options = { sanitize: true };
-  const dpe = options.sanitize ? dpeSanitizerService.execute(inputDpe) : inputDpe;
+  let dpe;
+  if (options.sanitize) {
+    dpe = dpeSanitizerService.execute(inputDpe);
+  } else {
+    dpe = inputDpe;
+    if (use_enum_as_string) {
+      useEnumAsString(inputDpe);
+    }
+  }
   const modele = enums.modele_dpe[dpe.administratif.enum_modele_dpe_id];
   const dateDpe = dpe.administratif.date_etablissement_dpe;
   if (modele !== 'dpe 3cl 2021 méthode logement') {
diff --git a/src/utils.js b/src/utils.js
index 4ecfd87..d7439ca 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -39,6 +39,18 @@ export function set_bug_for_bug_compat() {
   bug_for_bug_compat = true;
 }
 
+export function useEnumAsString(jsonObj) {
+  for (const key in jsonObj) {
+    if (jsonObj.hasOwnProperty(key)) {
+      if (key.startsWith('enum_')) {
+        if (jsonObj[key] !== null) jsonObj[key] = jsonObj[key].toString();
+      } else if (typeof jsonObj[key] === 'object') {
+        useEnumAsString(jsonObj[key]);
+      }
+    }
+  }
+}
+
 export let use_enum_as_string = false;
 export function set_use_enum_as_string() {
   use_enum_as_string = true;