diff --git a/flanker/mime/message/headers/wrappers.py b/flanker/mime/message/headers/wrappers.py
index 6e02a663..9a26bfb7 100644
--- a/flanker/mime/message/headers/wrappers.py
+++ b/flanker/mime/message/headers/wrappers.py
@@ -72,7 +72,7 @@ def is_headers_container(self):
             self.is_disposition_notification()
 
     def is_rfc_headers(self):
-        return self == 'text/rfc822-headers'
+        return self == 'text/rfc822-headers' or 'message/rfc822-headers'
 
     def is_message_external_body(self):
         return self == 'message/external-body'