Index: xfce4-session-4.8.2/xfce4-session/xfsm-shutdown-helper.c
===================================================================
--- xfce4-session-4.8.2.orig/xfce4-session/xfsm-shutdown-helper.c
+++ xfce4-session-4.8.2/xfce4-session/xfsm-shutdown-helper.c
@@ -1783,8 +1783,13 @@ gboolean xfsm_shutdown_helper_restart (X
  **/
 gboolean xfsm_shutdown_helper_suspend (XfsmShutdownHelper *helper, GError **error)
 {
+  gboolean ret;
   g_return_val_if_fail (!error || !*error, FALSE);
 
+  ret = g_spawn_command_line_async ("xflock4", NULL);
+  if (!ret)
+      g_warning("Could not lock screen");
+
 #ifdef ENABLE_UPOWER
   if ( helper->sleep_backend == XFSM_SLEEP_BACKEND_UPOWER )
     {
@@ -1810,8 +1815,13 @@ gboolean xfsm_shutdown_helper_suspend (X
  **/
 gboolean xfsm_shutdown_helper_hibernate (XfsmShutdownHelper *helper, GError **error)
 {
+  gboolean ret;
   g_return_val_if_fail (!error || !*error, FALSE);
 
+  ret = g_spawn_command_line_async ("xflock4", NULL);
+  if (!ret)
+      g_warning("Could not lock screen");
+
 #ifdef ENABLE_UPOWER
   if ( helper->sleep_backend == XFSM_SLEEP_BACKEND_UPOWER )
     {