diff --git a/database/migrations/2024_07_02_155058_update_member_participants_column.php b/database/migrations/2024_07_02_155058_update_member_participants_column.php
index 5c1a1d3e..ccec6a2f 100644
--- a/database/migrations/2024_07_02_155058_update_member_participants_column.php
+++ b/database/migrations/2024_07_02_155058_update_member_participants_column.php
@@ -16,7 +16,7 @@ return new class extends Migration
     public function up()
     {
         Schema::table('participants', function (Blueprint $table) {
-            $table->renameColumn('mitgliedsnr', 'member_id')->nullable();
+            $table->renameColumn('mitgliedsnr', 'member_id');
         });
 
         Schema::table('participants', function (Blueprint $table) {
diff --git a/tests/Feature/Form/FormRegisterActionTest.php b/tests/Feature/Form/FormRegisterActionTest.php
index 9af378ac..26ce9571 100644
--- a/tests/Feature/Form/FormRegisterActionTest.php
+++ b/tests/Feature/Form/FormRegisterActionTest.php
@@ -430,7 +430,7 @@ class FormRegisterActionTest extends FormTestCase
             ->create();
 
         $this->register($form, ['email' => 'max@muster.de'])->assertOk();
-        $this->assertNull($form->participants->first()->mitgliedsnr);
+        $this->assertNull($form->participants->first()->member_id);
         $this->assertNull($form->participants->first()->parent_id);
     }