diff --git a/spice.proto b/spice.proto
index 34ba3c8..616b960 100644
--- a/spice.proto
+++ b/spice.proto
@@ -1305,6 +1305,7 @@ channel SmartcardChannel : BaseChannel {
         vsc_message_type type;
         uint32 reader_id;
         uint32 length;
+        uint8 data[length] @end @nomarshal;
     } @ctype(VSCMsgHeader) header = 101;
 /* See comment on client data message above */
 /*