diff --git a/lib/rack/pact_broker/convert_file_extension_to_accept_header.rb b/lib/rack/pact_broker/convert_file_extension_to_accept_header.rb
index 37defd090..f2f4b1585 100644
--- a/lib/rack/pact_broker/convert_file_extension_to_accept_header.rb
+++ b/lib/rack/pact_broker/convert_file_extension_to_accept_header.rb
@@ -11,7 +11,7 @@ class ConvertFileExtensionToAcceptHeader
         ".csv" => "text/csv",
         ".svg" => "image/svg+xml",
         ".json" => "application/hal+json",
-        ".yaml" => "application/x-yaml"
+        ".yaml" => "application/yaml"
       }
 
       def initialize app