Index: /trunk/src/VBox/VMM/VMMR0/CPUMR0.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR0/CPUMR0.cpp	(revision 44175)
+++ /trunk/src/VBox/VMM/VMMR0/CPUMR0.cpp	(revision 44176)
@@ -744,5 +744,6 @@
         && ASMIsValidStdRange(uMaxLeaf))
     {
-        ASMCpuId(1, &u32MaxIdx, &u32EBX, &u32ECX, &u32EDX);
+        uint32_t uDummy;
+        ASMCpuId(1, &uDummy, &u32EBX, &u32ECX, &u32EDX);
         if (    (u32EDX & X86_CPUID_FEATURE_EDX_APIC)
             &&  (u32EDX & X86_CPUID_FEATURE_EDX_MSR))