--- dbus-1.8.20/dbus/dbus-connection.c	2015-05-14 13:23:25.000000000 +0100
+++ x.c	2017-09-19 15:13:26.996377161 +0100
@@ -2318,6 +2318,8 @@
   HAVE_LOCK_CHECK (connection);
 }
 
+#include <unistd.h>
+
 static void
 complete_pending_call_and_unlock (DBusConnection  *connection,
                                   DBusPendingCall *pending,
@@ -2326,7 +2328,7 @@
   _dbus_pending_call_set_reply_unlocked (pending, message);
   _dbus_pending_call_ref_unlocked (pending); /* in case there's no app with a ref held */
   _dbus_connection_detach_pending_call_and_unlock (connection, pending);
- 
+usleep(1000);
   /* Must be called unlocked since it invokes app callback */
   _dbus_pending_call_complete (pending);
   dbus_pending_call_unref (pending);