diff --git a/src/Service/ParticipantDataPrefiller.php b/src/Service/ParticipantDataPrefiller.php
index c6a45cf..962c23a 100644
--- a/src/Service/ParticipantDataPrefiller.php
+++ b/src/Service/ParticipantDataPrefiller.php
@@ -142,7 +142,7 @@ class ParticipantDataPrefiller
         $address->street = 'Musterstr. 123';
         $address->postCode = '99999';
         $address->city = 'MusterOrt';
-        $address->country = 'Deutschland';
+        $address->country = 'DE';
         $participant->address = $address;
     }
 }
diff --git a/tests/Service/ParticipantDataPrefillerTest.php b/tests/Service/ParticipantDataPrefillerTest.php
index 6bd2c04..717b601 100644
--- a/tests/Service/ParticipantDataPrefillerTest.php
+++ b/tests/Service/ParticipantDataPrefillerTest.php
@@ -276,6 +276,7 @@ class ParticipantDataPrefillerTest extends TestCase
         $this->assertSame('teilnehmer.in1@example.com', $participant->email);
         $this->assertSame('2006-01-15', $participant->dateOfBirth?->format('Y-m-d'));
         $this->assertSame('Musterstr. 123', $participant->address?->street);
+        $this->assertSame('DE', $participant->address?->country);
 
         CarbonImmutable::setTestNow();
     }