diff --git a/include/envelope.h b/include/envelope.h
index 10038f4..763d84d 100644
--- a/include/envelope.h
+++ b/include/envelope.h
@@ -72,6 +72,7 @@ public:
      *  @param  envelope    the envelope to copy
      */
     Envelope(const Envelope &envelope) :
+        MetaData(envelope),
         _str(envelope._body, envelope._bodySize),
         _body(_str.data()),
         _bodySize(_str.size())