diff --git a/src/Queue/PhpRedis.php b/src/Queue/PhpRedis.php
index 530be0d..fdebb36 100644
--- a/src/Queue/PhpRedis.php
+++ b/src/Queue/PhpRedis.php
@@ -2,12 +2,14 @@
 
 namespace Drupal\redis\Queue;
 
+use Drupal\Core\Queue\QueueInterface;
+
 /**
  * Redis queue implementation using PhpRedis extension backend.
  *
  * @ingroup queue
  */
-class PhpRedis extends QueueBase {
+class PhpRedis extends QueueBase implements QueueInterface {
 
   /**
    * The Redis connection.