diff --git a/backend/services/config_service.py b/backend/services/config_service.py
index 7d9144d..6400eb7 100644
--- a/backend/services/config_service.py
+++ b/backend/services/config_service.py
@@ -128,13 +128,13 @@ class ConfigService:
         cfg = Config()
 
         if "app" in raw:
-            cfg.app = AppConfig(**{k: v for k, v in raw["app"].items() if hasattr(AppConfig, k)})
+            cfg.app = AppConfig(**{k: v for k, v in raw["app"].items() if k in AppConfig.__dataclass_fields__})
 
         if "photobooth" in raw:
-            cfg.photobooth = PhotoboothConfig(**{k: v for k, v in raw["photobooth"].items() if hasattr(PhotoboothConfig, k)})
+            cfg.photobooth = PhotoboothConfig(**{k: v for k, v in raw["photobooth"].items() if k in PhotoboothConfig.__dataclass_fields__})
 
         if "button" in raw:
-            cfg.button = ButtonConfig(**{k: v for k, v in raw["button"].items() if hasattr(ButtonConfig, k)})
+            cfg.button = ButtonConfig(**{k: v for k, v in raw["button"].items() if k in ButtonConfig.__dataclass_fields__})
 
         if "leds" in raw:
             led_raw = raw["leds"]
@@ -150,13 +150,13 @@ class ConfigService:
             )
 
         if "print" in raw:
-            cfg.print = PrintConfig(**{k: v for k, v in raw["print"].items() if hasattr(PrintConfig, k)})
+            cfg.print = PrintConfig(**{k: v for k, v in raw["print"].items() if k in PrintConfig.__dataclass_fields__})
 
         if "gallery" in raw:
-            cfg.gallery = GalleryConfig(**{k: v for k, v in raw["gallery"].items() if hasattr(GalleryConfig, k)})
+            cfg.gallery = GalleryConfig(**{k: v for k, v in raw["gallery"].items() if k in GalleryConfig.__dataclass_fields__})
 
         if "event" in raw:
-            cfg.event = EventConfig(**{k: v for k, v in raw["event"].items() if hasattr(EventConfig, k)})
+            cfg.event = EventConfig(**{k: v for k, v in raw["event"].items() if k in EventConfig.__dataclass_fields__})
 
         cfg.button_actions = raw.get("button_actions", {
             1: {"label": "Photo normale", "photobooth_index": 0},