diff --git a/src/Plugin/search_api/processor/AddHierarchy.php b/src/Plugin/search_api/processor/AddHierarchy.php
index 220c5c8..dccd6a6 100644
--- a/src/Plugin/search_api/processor/AddHierarchy.php
+++ b/src/Plugin/search_api/processor/AddHierarchy.php
@@ -167,7 +167,7 @@ class AddHierarchy extends ProcessorPluginBase implements PluginFormInterface {
       // Special handling if this is a taxonomy field.
       if ($taxonomy_hierarchy) {
         // Add each parent.
-        foreach ($this->entityTypeManager->getStorage('taxonomy_term')->loadParents($id) as $parent) {
+        foreach ($this->entityTypeManager->getStorage('taxonomy_term')->loadAllParents($id) as $parent) {
           $values[] = $parent->id();
         }