diff --git a/config/validator/validation.yaml b/config/validator/validation.yaml
index a562bbb5..4fc00841 100644
--- a/config/validator/validation.yaml
+++ b/config/validator/validation.yaml
@@ -10,11 +10,12 @@ App\Entity\Alias:
                 maxLength: 24
 
 App\Entity\Domain:
+    constraints:
+        - Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity: name
     properties:
         name:
             - NotNull: ~
             - NotBlank: ~
-            - App\Validator\Constraints\Domain: ~
 
 App\Entity\User:
     properties:
diff --git a/default_translations/de/validators.de.yml b/default_translations/de/validators.de.yml
index 050a3f53..e93707c3 100644
--- a/default_translations/de/validators.de.yml
+++ b/default_translations/de/validators.de.yml
@@ -9,7 +9,6 @@ form:
     werden.
   registration-recovery-token-noack: Dieses Feld muss ausgewählt werden.
   invalid-token: Der Code hat ein ungültiges Format.
-  already-exists: "Existiert bereits."
 
 registration:
   voucher-invalid: Der Einladungscode ist ungültig.
diff --git a/default_translations/en/validators.en.yml b/default_translations/en/validators.en.yml
index 3c3c9c6a..5f87d8fc 100644
--- a/default_translations/en/validators.en.yml
+++ b/default_translations/en/validators.en.yml
@@ -11,7 +11,6 @@ form:
   invalid-token: "This token has an invalid format."
   twofactor-secret-invalid: "The verification code is not valid."
   twofactor-backup-ack-missing: "This needs to be checked."
-  already-exists: "Already exists."
 
 registration:
   voucher-invalid: "The invite code is invalid."
diff --git a/src/Validator/Constraints/Domain.php b/src/Validator/Constraints/Domain.php
deleted file mode 100644
index 45ff34ca..00000000
--- a/src/Validator/Constraints/Domain.php
+++ /dev/null
@@ -1,9 +0,0 @@
-<?php
-
-namespace App\Validator\Constraints;
-
-use Symfony\Component\Validator\Constraint;
-
-class Domain extends Constraint
-{
-}
diff --git a/src/Validator/Constraints/DomainValidator.php b/src/Validator/Constraints/DomainValidator.php
deleted file mode 100644
index 32d63ac1..00000000
--- a/src/Validator/Constraints/DomainValidator.php
+++ /dev/null
@@ -1,31 +0,0 @@
-<?php
-
-namespace App\Validator\Constraints;
-
-use App\Entity\Domain;
-use App\Repository\DomainRepository;
-use Doctrine\ORM\EntityManagerInterface;
-use Symfony\Component\Validator\Constraint;
-use Symfony\Component\Validator\ConstraintValidator;
-use Symfony\Component\Validator\Exception\UnexpectedTypeException;
-
-class DomainValidator extends ConstraintValidator
-{
-    private DomainRepository $domainRepository;
-
-    public function __construct(EntityManagerInterface $manager)
-    {
-        $this->domainRepository = $manager->getRepository(Domain::class);
-    }
-
-    public function validate($value, Constraint $constraint): void
-    {
-        if (!is_string($value)) {
-            throw new UnexpectedTypeException($value, 'string');
-        }
-
-        if ($this->domainRepository->findByName($value) !== null) {
-            $this->context->addViolation('form.already-exists');
-        }
-    }
-}
diff --git a/tests/Validator/Constraints/DomainValidatorTest.php b/tests/Validator/Constraints/DomainValidatorTest.php
deleted file mode 100644
index d07de0de..00000000
--- a/tests/Validator/Constraints/DomainValidatorTest.php
+++ /dev/null
@@ -1,56 +0,0 @@
-<?php
-
-use App\Entity\Domain as DomainEntity;
-use App\Repository\DomainRepository;
-use App\Validator\Constraints\Domain;
-use App\Validator\Constraints\DomainValidator;
-use Doctrine\ORM\EntityManagerInterface;
-use Symfony\Component\Validator\Exception\UnexpectedTypeException;
-use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
-
-class DomainValidatorTest extends ConstraintValidatorTestCase
-{
-    private $domain = 'example.org';
-
-    protected function createValidator(): DomainValidator
-    {
-        $domainRepository = $this->getMockBuilder(DomainRepository::class)
-            ->disableOriginalConstructor()
-            ->getMock();
-        $domainRepository->method('findByName')->willReturnCallback(function ($name) {
-            if ($name === $this->domain) {
-                return new DomainEntity();
-            }
-
-            return null;
-        });
-        $manager = $this->getMockBuilder(EntityManagerInterface::class)->getMock();
-        $manager->method('getRepository')->willReturnMap([
-            [DomainEntity::class, $domainRepository],
-        ]);
-
-        return new DomainValidator($manager);
-    }
-
-    public function testIsNotString()
-    {
-        $this->expectException(UnexpectedTypeException::class);
-
-        $this->validator->validate(42, new Domain());
-    }
-
-    public function testIsValid()
-    {
-        $this->validator->validate('example.com', new Domain());
-
-        $this->assertNoViolation();
-    }
-
-    public function testIsNotUnique()
-    {
-        $this->validator->validate($this->domain, new Domain());
-
-        $this->buildViolation('form.already-exists')
-            ->assertRaised();
-    }
-}