diff --git a/src/lib/MVC/Symfony/Controller/Content/PreviewController.php b/src/lib/MVC/Symfony/Controller/Content/PreviewController.php
index 88bfd9a19b..2d0d5879cc 100644
--- a/src/lib/MVC/Symfony/Controller/Content/PreviewController.php
+++ b/src/lib/MVC/Symfony/Controller/Content/PreviewController.php
@@ -113,7 +113,7 @@ public function previewContentAction(
         }
 
         try {
-            $viewType = $request->query->get('viewType') ?? ViewManagerInterface::VIEW_TYPE_FULL;
+            $viewType = $request->query->get('viewType', ViewManagerInterface::VIEW_TYPE_FULL);
             $response = $this->kernel->handle(
                 $this->getForwardRequest($location, $content, $siteAccess, $request, $language, $viewType),
                 HttpKernelInterface::SUB_REQUEST,