diff --git a/tests/src/Unit/AssetHttpMiddlewareTest.php b/tests/src/Unit/AssetHttpMiddlewareTest.php
index 4e6d61f..96f0d1a 100644
--- a/tests/src/Unit/AssetHttpMiddlewareTest.php
+++ b/tests/src/Unit/AssetHttpMiddlewareTest.php
@@ -69,6 +69,7 @@ public function xmlResponseProvider() : array {
     return [
       ['application/xml'],
       ['application/xml; charset=utf-8'],
+      ['application/rss+xml; charset=utf-8'],
     ];
   }