diff --git a/src/NetteLatteEngine.php b/src/NetteLatteEngine.php
index 5c9d4f5..ffbbe9d 100644
--- a/src/NetteLatteEngine.php
+++ b/src/NetteLatteEngine.php
@@ -151,7 +151,7 @@ public function registerCustomTemplates(array $page_templates, \WP_Theme $theme,
         continue;
       }
 
-      if (!$headers->postType) {
+      if (!$headers['postType']) {
         $headers['postType'] = 'page';
       }