diff --git a/src/Bundle/ChillPersonBundle/Tests/Export/Aggregator/AccompanyingCourseAggregators/ReferrerScopeAggregatorTest.php b/src/Bundle/ChillPersonBundle/Tests/Export/Aggregator/AccompanyingCourseAggregators/ReferrerScopeAggregatorTest.php
index 738769b7b..848cee27e 100644
--- a/src/Bundle/ChillPersonBundle/Tests/Export/Aggregator/AccompanyingCourseAggregators/ReferrerScopeAggregatorTest.php
+++ b/src/Bundle/ChillPersonBundle/Tests/Export/Aggregator/AccompanyingCourseAggregators/ReferrerScopeAggregatorTest.php
@@ -23,6 +23,7 @@ use Chill\PersonBundle\Export\Aggregator\AccompanyingCourseAggregators\ReferrerS
 use Doctrine\ORM\EntityManagerInterface;
 use Prophecy\Argument;
 use Prophecy\PhpUnit\ProphecyTrait;
+use Symfony\Component\Clock\MockClock;
 
 /**
  * @internal
@@ -49,7 +50,7 @@ final class ReferrerScopeAggregatorTest extends AbstractAggregatorTest
         return new ReferrerScopeAggregator(
             $scopeRepository->reveal(),
             $translatableStringHelper->reveal(),
-            new RollingDateConverter(),
+            new RollingDateConverter(new MockClock()),
         );
     }