diff --git a/src/Form/BookingParticipantType.php b/src/Form/BookingParticipantType.php
index 395f822..4d2c2f1 100644
--- a/src/Form/BookingParticipantType.php
+++ b/src/Form/BookingParticipantType.php
@@ -205,8 +205,8 @@ class BookingParticipantType extends AbstractType
         if ($this->fieldStateProvider->shouldIncludeField('gender', $bookingDto, $participantIndex)) {
             $form->add('gender', ChoiceType::class, $this->mergeFieldState([
                 'label' => 'Gender',
-                'required' => false,
-                'placeholder' => 'keine Angabe',
+                'required' => !$personalDataOptional,
+                'placeholder' => $personalDataOptional ? 'keine Angabe' : false,
                 'choices' => [
                     'männlich' => 'M',
                     'weiblich' => 'W',
diff --git a/src/Form/Model/ParticipantDto.php b/src/Form/Model/ParticipantDto.php
index 8ee3c91..3118c09 100644
--- a/src/Form/Model/ParticipantDto.php
+++ b/src/Form/Model/ParticipantDto.php
@@ -52,7 +52,11 @@ class ParticipantDto
     #[Assert\NotBlank(message: 'Bitte angeben', groups: ['strict_required'])]
     public ?string $lastName = null;
     public ?string $title = null;
+
+    #[Assert\NotBlank(message: 'Bitte angeben', groups: ['strict_required'])]
     public ?string $gender = null;
+
+    #[Assert\NotBlank(message: 'Bitte angeben', groups: ['strict_required'])]
     public ?string $nationality = null;
 
     public ?string $height = null;