diff --git a/src/Serialization/DomainEventSerializer.php b/src/Serialization/DomainEventSerializer.php
index <HASH>..<HASH> 100644
--- a/src/Serialization/DomainEventSerializer.php
+++ b/src/Serialization/DomainEventSerializer.php
@@ -1,5 +1,7 @@
 <?php namespace EventSourcery\EventSourcery\Serialization;
 
+use EventSourcery\EventSourcery\EventSourcing\DomainEvent;
+
 interface DomainEventSerializer {
     function serialize(DomainEvent $event): array;
     function deserialize(array $serialized): DomainEvent;
Update DomainEventSerializer.php