Index: /trunk/src/VBox/Main/src-server/linux/HostPowerLinux.cpp
===================================================================
--- /trunk/src/VBox/Main/src-server/linux/HostPowerLinux.cpp	(revision 55650)
+++ /trunk/src/VBox/Main/src-server/linux/HostPowerLinux.cpp	(revision 55651)
@@ -92,4 +92,5 @@
 DECLCALLBACK(int) HostPowerServiceLinux::powerChangeNotificationThread(RTTHREAD hThreadSelf, void *pInstance)
 {
+    NOREF(hThreadSelf);
     HostPowerServiceLinux *pPowerObj = static_cast<HostPowerServiceLinux *>(pInstance);