diff --git a/src/Form/ParticipantType.php b/src/Form/ParticipantType.php
index b6f2909..6a81ac8 100644
--- a/src/Form/ParticipantType.php
+++ b/src/Form/ParticipantType.php
@@ -33,6 +33,7 @@ class ParticipantType extends AbstractType
             $form = $event->getForm();
 
             $personalDataMutable = $options['personal_data_mutable'] && $participantData->mutable;
+            $isApplicant = 1 === $participantIndex;
 
             $form
                 ->add('firstName', TextType::class, [
@@ -83,14 +84,14 @@ class ParticipantType extends AbstractType
                     'label' => 'E-Mail',
                     'required' => false,
                     'attr' => [
-                        'readonly' => false === $personalDataMutable,
+                        'readonly' => true === $isApplicant,
                     ],
                 ])
                 ->add('mobile', TextType::class, [
                     'label' => 'Telefon (mobil)',
                     'required' => false,
                     'attr' => [
-                        'readonly' => false === $personalDataMutable,
+                        'readonly' => true === $isApplicant,
                     ],
                 ])
                 ->add('height', ChoiceType::class, [