diff --git a/backend/src/routes/preferences.js b/backend/src/routes/preferences.js
index 46a3b50..0dfbc0a 100644
--- a/backend/src/routes/preferences.js
+++ b/backend/src/routes/preferences.js
@@ -8,6 +8,7 @@ const ALLOWED_KEYS = new Set([
   'chart_interets',
   'chart_capital',
   'chart_cashback',
+  'pfo_assujetti',
   // Extensible : ajouter ici les futures prefs (theme, font_scale, langue, devise, display_mode…)
 ]);