diff --git a/spec/Validator/Constraints/SourceValidatorSpec.php b/spec/Validator/Constraints/SourceValidatorSpec.php
index c2e4022..0cd9306 100644
--- a/spec/Validator/Constraints/SourceValidatorSpec.php
+++ b/spec/Validator/Constraints/SourceValidatorSpec.php
@@ -72,10 +72,14 @@ function it_does_not_add_violation_if_there_is_no_other_redirect(
         RedirectInterface $redirect,
         RedirectRepositoryInterface $redirectRepository
     ): void {
+        $source = '/dumb-source';
         $redirect->isEnabled()->willReturn(true);
-        $redirect->getId()->willReturn(1);
+        $redirect->getSource()->willReturn($source);
+        $redirect->isEnabled()->shouldBeCalled();
+        $redirect->getSource()->shouldBeCalled();
+        $redirect->getId()->shouldBeCalled();
 
-        $redirectRepository->findBy(['source' => $redirect, 'enabled' => true])
+        $redirectRepository->findBy(['source' => $source, 'enabled' => true])
             ->willReturn([$redirect]);
 
         $context->buildViolation(Argument::any())->shouldNotBeCalled();
@@ -90,11 +94,12 @@ function it_adds_a_violation_if_there_is_another_route_with_the_same_source(
         RedirectRepositoryInterface $redirectRepository,
         ConstraintViolationBuilderInterface $violationBuilder
     ): void {
+        $source = '/some-route';
         $redirect->isEnabled()->willReturn(true);
         $redirect->getId()->willReturn(null);
-        $redirect->getSource()->willReturn('/some-route');
+        $redirect->getSource()->willReturn($source);
 
-        $redirectRepository->findBy(['source' => $redirect, 'enabled' => true])
+        $redirectRepository->findBy(['source' => $source, 'enabled' => true])
             ->willReturn([$redirect, $conflictingRedirects]);
 
         $conflictingRedirects->getId()->willReturn(1);
diff --git a/src/Validator/Constraints/SourceValidator.php b/src/Validator/Constraints/SourceValidator.php
index 6dc08a9..2b3c683 100644
--- a/src/Validator/Constraints/SourceValidator.php
+++ b/src/Validator/Constraints/SourceValidator.php
@@ -44,7 +44,7 @@ public function validate($value, Constraint $constraint): void
         }
 
         /** @var RedirectInterface[] $conflictingRedirects */
-        $conflictingRedirects = $this->redirectRepository->findBy(['source' => $value, 'enabled' => true]);
+        $conflictingRedirects = $this->redirectRepository->findBy(['source' => $value->getSource(), 'enabled' => true]);
         $conflictingRedirects = array_filter($conflictingRedirects, function (RedirectInterface $conflictingRedirect) use ($value): bool {
             return $conflictingRedirect->getId() !== $value->getId();
         });