diff --git a/Classes/ViewHelpers/Link/ArchiveViewHelper.php b/Classes/ViewHelpers/Link/ArchiveViewHelper.php
index e833c4c5..3383365f 100644
--- a/Classes/ViewHelpers/Link/ArchiveViewHelper.php
+++ b/Classes/ViewHelpers/Link/ArchiveViewHelper.php
@@ -59,7 +59,7 @@ public function render(): string
             ->setUseCacheHash(true);
         if ($rssFormat) {
             $uriBuilder
-                ->setTargetPageType($this->getTypoScriptFrontendController()->tmpl->setup['blog_rss_archive.']['typeNum']);
+                ->setTargetPageType((int)$this->getTypoScriptFrontendController()->tmpl->setup['blog_rss_archive.']['typeNum']);
         }
         $uri = $uriBuilder->uriFor('listPostsByDate', $arguments, 'Post', 'Blog', 'Archive');
         if ($uri !== '') {
diff --git a/Classes/ViewHelpers/Link/AuthorViewHelper.php b/Classes/ViewHelpers/Link/AuthorViewHelper.php
index 3b6d1a37..47ef22d3 100644
--- a/Classes/ViewHelpers/Link/AuthorViewHelper.php
+++ b/Classes/ViewHelpers/Link/AuthorViewHelper.php
@@ -96,7 +96,7 @@ protected function getUriBuilder(int $pageUid, array $additionalParams, bool $rs
             ->setArguments($additionalParams);
         if ($rssFormat) {
             $uriBuilder
-                ->setTargetPageType($this->getTypoScriptFrontendController()->tmpl->setup['blog_rss_author.']['typeNum']);
+                ->setTargetPageType((int)$this->getTypoScriptFrontendController()->tmpl->setup['blog_rss_author.']['typeNum']);
         }
 
         return $uriBuilder;