diff --git a/lib/travis/api/app/responders/badge.rb b/lib/travis/api/app/responders/badge.rb
index 6d7050b3..6c759b85 100644
--- a/lib/travis/api/app/responders/badge.rb
+++ b/lib/travis/api/app/responders/badge.rb
@@ -10,7 +10,7 @@ module Travis::Api::App::Responders
     end
 
     def content_type
-      "image/svg"
+      "image/svg+xml"
     end
 
     def filename