core/lib/Drupal/Core/Routing/ContentTypeHeaderMatcher.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/lib/Drupal/Core/Routing/ContentTypeHeaderMatcher.php b/core/lib/Drupal/Core/Routing/ContentTypeHeaderMatcher.php
index 13e18f3..4793472 100644
--- a/core/lib/Drupal/Core/Routing/ContentTypeHeaderMatcher.php
+++ b/core/lib/Drupal/Core/Routing/ContentTypeHeaderMatcher.php
@@ -54,7 +54,7 @@ public function filter(RouteCollection $collection, Request $request) {
    * {@inheritdoc}
    */
   public function applies(Route $route) {
-    return TRUE;
+    return $route->hasRequirement('_content_type_format');
   }
 
 }