diff --git a/config/services/search/index.yaml b/config/services/search/index.yaml
index 2857a213d..a3a14d66d 100644
--- a/config/services/search/index.yaml
+++ b/config/services/search/index.yaml
@@ -85,3 +85,5 @@ services:
 
     Pimcore\Bundle\GenericDataIndexBundle\Service\SearchIndex\ClassDefinition\ClassDefinitionReindexServiceInterface:
         class: Pimcore\Bundle\GenericDataIndexBundle\Service\SearchIndex\ClassDefinition\ClassDefinitionReindexService
+
+    Pimcore\Bundle\GenericDataIndexBundle\Service\SearchIndex\UnusedIndexCleanupService: ~