diff --git a/Classes/Frontend/RssFeed/SitemapDataProvider.php b/Classes/Frontend/RssFeed/SitemapDataProvider.php
index 8b1c656..a78c4db 100644
--- a/Classes/Frontend/RssFeed/SitemapDataProvider.php
+++ b/Classes/Frontend/RssFeed/SitemapDataProvider.php
@@ -42,7 +42,7 @@ class SitemapDataProvider extends RecordsXmlSitemapDataProvider
         array $config = [],
         ContentObjectRenderer $cObj = null
     ) {
-        $categoryUid = intval($request->getQueryParams()['category'] ?? 0);
+        $categoryUid = intval($request->getQueryParams()['category_id'] ?? 0);
         if ($categoryUid > 0) {
             $pageUids = $this->getPageUidsWithRelationToCategory($categoryUid);
             $config['additionalWhere'] = ($config['additionalWhere'] ?? '')
diff --git a/Configuration/TypoScript/Setup/RssFeed.typoscript b/Configuration/TypoScript/Setup/RssFeed.typoscript
index f292274..d91c7cd 100644
--- a/Configuration/TypoScript/Setup/RssFeed.typoscript
+++ b/Configuration/TypoScript/Setup/RssFeed.typoscript
@@ -59,7 +59,7 @@ page {
                         10 = TEXT
                         10.value = &type=1533906435&sitemap=blog-posts
                         11 = TEXT
-                        11.value = &category=
+                        11.value = &category_id=
                         12 = TEXT
                         // uid is casted to int within PHP source
                         12.data.dataWrap = DB : sys_category:{GP:topic_id}:uid
@@ -77,10 +77,10 @@ seo_sitemap {
         userFunc {
             variables {
                 categoryId = TEXT
-                categoryId.data = GP:category
+                categoryId.data = GP:category_id
                 categoryId.intval = 1
                 categoryTitle = TEXT
-                categoryTitle.data.dataWrap = DB : sys_category:{GP:category}:title
+                categoryTitle.data.dataWrap = DB : sys_category:{GP:category_id}:title
             }
         }
     }
diff --git a/Resources/Private/Templates/Sitemaps/RssFeed.xml b/Resources/Private/Templates/Sitemaps/RssFeed.xml
index ada3c2f..d384255 100644
--- a/Resources/Private/Templates/Sitemaps/RssFeed.xml
+++ b/Resources/Private/Templates/Sitemaps/RssFeed.xml
@@ -6,7 +6,7 @@
                 <title>Daniel Siepmann - Coding is Art - Blog Posts {settings.categoryTitle}</title>
                 <description>List of {settings.categoryTitle} blog posts at daniel-siepmann.de</description>
                 <link>{f:uri.page(pageUid: 11, additionalParams: {topic_id: settings.categoryId}, absolute: 1)}</link>
-                <atom:link href="{f:uri.page(pageUid: 1. pageType: 1533906435, additionalParams: {sitemap: 'blog-posts', category: settings.categoryId}, absolute: 1)}" rel="self" type="application/rss+xml" />
+                <atom:link href="{f:uri.page(pageUid: 1. pageType: 1533906435, additionalParams: {sitemap: 'blog-posts', category_id: settings.categoryId}, absolute: 1)}" rel="self" type="application/rss+xml" />
             </f:then>
             <f:else>
                 <title>Daniel Siepmann - Coding is Art - All Blog Posts</title>