diff --git a/src/fiber_package/signup/element/form_checkmarks.py b/src/fiber_package/signup/element/form_checkmarks.py
index 36887f5..d0af93c 100644
--- a/src/fiber_package/signup/element/form_checkmarks.py
+++ b/src/fiber_package/signup/element/form_checkmarks.py
@@ -9,6 +9,7 @@ from fiber_package.signup.answer.answer_checkmarks import AnswerCheckmarks
 class CheckmarkQuestion(BaseModel):
     question_en: str
     question_nl: str
+    default: bool = False
 
 class FormCheckmarks(FormBaseQuestion):
     category: Literal[FormElementCategory.checkmarks]