diff --git a/Classes/Service/CompileService.php b/Classes/Service/CompileService.php
index 3c028e204..18c8a08e2 100644
--- a/Classes/Service/CompileService.php
+++ b/Classes/Service/CompileService.php
@@ -67,6 +67,7 @@ public function getCompiledFile(string $file): ?string
             && is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/bootstrap-package/css']['parser'])
         ) {
             foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/bootstrap-package/css']['parser'] as $className) {
+                /** @var class-string<ParserInterface> $className */
                 $parser = GeneralUtility::makeInstance($className);
                 if ($parser instanceof ParserInterface
                     && isset($settings['file']['info']['extension'])
diff --git a/Classes/Service/IconService.php b/Classes/Service/IconService.php
index 01a84879d..3083087b1 100644
--- a/Classes/Service/IconService.php
+++ b/Classes/Service/IconService.php
@@ -79,6 +79,7 @@ public function getIconProviders(): array
             && is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/bootstrap-package/icons']['provider'])
         ) {
             foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/bootstrap-package/icons']['provider'] as $className) {
+                /** @var class-string<IconProviderInterface> $className */
                 $iconProviders[] = GeneralUtility::makeInstance($className);
             }
         }