diff --git a/core/lib/Drupal/Core/Routing/ContentTypeHeaderMatcher.php b/core/lib/Drupal/Core/Routing/ContentTypeHeaderMatcher.php
index 7d66b50ecef..d6452e8be03 100644
--- a/core/lib/Drupal/Core/Routing/ContentTypeHeaderMatcher.php
+++ b/core/lib/Drupal/Core/Routing/ContentTypeHeaderMatcher.php
@@ -42,7 +42,7 @@ class ContentTypeHeaderMatcher implements FilterInterface {
     // We do not throw a
     // \Symfony\Component\Routing\Exception\ResourceNotFoundException here
     // because we don't want to return a 404 status code, but rather a 415.
-    if (!$request->headers->has('Content-Type')) {
+    if (!$request->headers->get('Content-Type', FALSE)) {
       throw new UnsupportedMediaTypeHttpException('No "Content-Type" request header specified');
     }
     else {