diff --git a/core/modules/update/src/UpdateFetcher.php b/core/modules/update/src/UpdateFetcher.php
index 5f22265..118d3a9 100644
--- a/core/modules/update/src/UpdateFetcher.php
+++ b/core/modules/update/src/UpdateFetcher.php
@@ -66,9 +66,9 @@ public function fetchProjectData(array $project, $site_key = '') {
     $url = $this->buildFetchUrl($project, $site_key);
     $data = '';
     try {
-      $data = $this->httpClient
+      $data = (string) $this->httpClient
         ->get($url, array('headers' => array('Accept' => 'text/xml')))
-        ->getBody(TRUE);
+        ->getBody();
     }
     catch (RequestException $exception) {
       watchdog_exception('update', $exception);
diff --git a/core/modules/update/src/UpdateProcessor.php b/core/modules/update/src/UpdateProcessor.php
index f129845..d37f643 100644
--- a/core/modules/update/src/UpdateProcessor.php
+++ b/core/modules/update/src/UpdateProcessor.php
@@ -161,7 +161,7 @@ public function processFetchTask($project) {
     $project_name = $project['name'];
 
     if (empty($this->failed[$fetch_url_base]) || $this->failed[$fetch_url_base] < $max_fetch_attempts) {
-      $data = (string) $this->updateFetcher->fetchProjectData($project, $site_key);
+      $data = $this->updateFetcher->fetchProjectData($project, $site_key);
     }
     if (!empty($data)) {
       $available = $this->parseXml($data);