diff --git a/tests/src/Kernel/BackendTestBase.php b/tests/src/Kernel/BackendTestBase.php
index 8311d02..06ce02e 100644
--- a/tests/src/Kernel/BackendTestBase.php
+++ b/tests/src/Kernel/BackendTestBase.php
@@ -1053,7 +1053,7 @@ abstract class BackendTestBase extends KernelTestBase {
     ));
     $index->save();
 
-    $indexed_count = $index->indexItems();
+    $indexed_count = $this->indexItems($index->id());
     $this->assertEquals(count($this->entities), $indexed_count);
 
     $search_count = $index->query()->execute()->getResultCount();