diff --git a/mbuni/mmsbox/mmsbox.c b/mbuni/mmsbox/mmsbox.c
index 269c96c..36fde30 100644
--- a/mbuni/mmsbox/mmsbox.c
+++ b/mbuni/mmsbox/mmsbox.c
@@ -1268,7 +1268,7 @@ static void sendmms_func(void *unused)
 					     1, NULL, 
 					     &err);
 		    if (res < 0)
-			 rb = octstr_imm("Error in message conversion");
+			 rb = octstr_format("Error in message conversion: %S", err);
 	       }  else if (!rb)
 		    rb = octstr_imm("Failed to send message");	       
 	       http_send_reply(client, (res == 0) ? HTTP_OK : HTTP_BAD_REQUEST, hh,