diff --git a/src/Plugin/search_api/datasource/ContentEntity.php b/src/Plugin/search_api/datasource/ContentEntity.php
index 5acd65c..781c681 100644
--- a/src/Plugin/search_api/datasource/ContentEntity.php
+++ b/src/Plugin/search_api/datasource/ContentEntity.php
@@ -698,6 +698,9 @@ class ContentEntity extends DatasourcePluginBase implements EntityDatasourceInte
       $page_size = $this->getConfigValue('tracking_page_size');
       assert('$page_size', 'Tracking page size is not set.');
       $select->range($page * $page_size, $page_size);
+      // Sort by entity id.
+      $entity_id = $this->getEntityType()->getKey('id');
+      $select->sort($entity_id);
     }
 
     $entity_ids = $select->execute();