Index: /trunk/src/VBox/HostServices/GuestControl/service.cpp
===================================================================
--- /trunk/src/VBox/HostServices/GuestControl/service.cpp	(revision 75869)
+++ /trunk/src/VBox/HostServices/GuestControl/service.cpp	(revision 75870)
@@ -2004,5 +2004,5 @@
     LogFlowFunc(("[Client %RU32] idFunction=%RU32 (%s), cParms=%RU32, paParms=0x%p\n",
                  idClient, idFunction, GstCtrlGuestFnName((eGuestFn)idFunction), cParms, paParms));
-    RT_NOREF(tsArrival);
+    RT_NOREF(tsArrival, idClient);
 
     /*
@@ -2014,4 +2014,5 @@
     ClientState *pClient = reinterpret_cast<ClientState *>(pvClient);
     AssertReturnVoidStmt(pClient, pThis->mpHelpers->pfnCallComplete(hCall, VERR_INVALID_CLIENT_ID));
+    Assert(pClient->mID == idClient);
 #else
     ClientStateMapIter ItClientState = pThis->mClientStateMap.find(idClient);