diff --git a/src/EventListener/GeneratePageListener.php b/src/EventListener/GeneratePageListener.php
index ecf1cf2..7cfa178 100644
--- a/src/EventListener/GeneratePageListener.php
+++ b/src/EventListener/GeneratePageListener.php
@@ -145,6 +145,13 @@ public function __invoke(PageModel $pageModel, LayoutModel $layoutModel, PageReg
 
         $objTemplate->glossaryConfig = $glossaryConfig;
 
+        // Tag glossary items
+        if (System::getContainer()->has('fos_http_cache.http.symfony_response_tagger'))
+        {
+            $responseTagger = System::getContainer()->get('fos_http_cache.http.symfony_response_tagger');
+            $responseTagger->addTags(array_map(static fn ($id) => 'contao.db.tl_glossary_item.'.$id, array_column($arrGlossaryItems, 'id')));
+        }
+
         $GLOBALS['TL_BODY'][] = $objTemplate->parse();
     }
 }