Index: /trunk/src/VBox/VMM/VMMR3/VMM.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR3/VMM.cpp	(revision 37594)
+++ /trunk/src/VBox/VMM/VMMR3/VMM.cpp	(revision 37595)
@@ -909,5 +909,5 @@
                 rc = PDMR3LdrGetSymbolR0(pVM, VMMR0_MAIN_MODULE_NAME, "vmmR0LoggerPrefix", &pfnLoggerPrefix);
                 AssertReleaseMsgRCReturn(rc, ("vmmR0LoggerPrefix not found! rc=%Rra\n", rc), rc);
-                rc = RTLogSetCustomPrefixCallbackForR0(&pR0LoggerR3->Logger, pVCpu->vmm.s.pR0LoggerR0, pfnLoggerPrefix, NULL);
+                rc = RTLogSetCustomPrefixCallbackForR0(&pR0LoggerR3->Logger, pVCpu->vmm.s.pR0LoggerR0, pfnLoggerPrefix, NIL_RTR0PTR);
                 AssertReleaseMsgRCReturn(rc, ("RTLogSetCustomPrefixCallback failed! rc=%Rra\n", rc), rc);