diff --git a/src/BeSimple/SoapCommon/Mime/MultiPart.php b/src/BeSimple/SoapCommon/Mime/MultiPart.php
index 161f472..d180671 100644
--- a/src/BeSimple/SoapCommon/Mime/MultiPart.php
+++ b/src/BeSimple/SoapCommon/Mime/MultiPart.php
@@ -179,6 +179,6 @@ class MultiPart extends PartHeader
      */
     public function generateBoundary()
     {
-        return 'urn:uuid:' . Helper::generateUUID();
+        return 'multipart-boundary-' . Helper::generateUUID() . '@response.info';
     }
 }
\ No newline at end of file