diff --git a/core/modules/rest/src/Plugin/views/display/RestExport.php b/core/modules/rest/src/Plugin/views/display/RestExport.php
index 0cd43e9..8af1a75 100644
--- a/core/modules/rest/src/Plugin/views/display/RestExport.php
+++ b/core/modules/rest/src/Plugin/views/display/RestExport.php
@@ -278,7 +278,7 @@ public function execute() {
     $header = [];
     $header['Content-type'] = $this->getMimeType();
 
-    $response = new CacheableResponse($output['#markup'], 200);
+    $response = new CacheableResponse($this->renderer->renderRoot($output), 200);
     $cache_metadata = CacheableMetadata::createFromRenderArray($output);
 
     $response->addCacheableDependency($cache_metadata);
diff --git a/core/modules/rest/src/Plugin/views/style/Serializer.php b/core/modules/rest/src/Plugin/views/style/Serializer.php
index ac41a00..6078c9f 100644
--- a/core/modules/rest/src/Plugin/views/style/Serializer.php
+++ b/core/modules/rest/src/Plugin/views/style/Serializer.php
@@ -132,8 +132,7 @@ public function render() {
       $content_type = $this->options['formats'] ? reset($this->options['formats']) : 'json';
     }
 
-    $output = $this->serializer->serialize($rows, $content_type);
-    return $output;
+    return $this->serializer->serialize($rows, $content_type);
   }
 
   /**