Index: /trunk/src/VBox/Installer/win/Stub/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Installer/win/Stub/Makefile.kmk	(revision 37990)
+++ /trunk/src/VBox/Installer/win/Stub/Makefile.kmk	(revision 37991)
@@ -28,5 +28,5 @@
 PROGRAMS.x86 += VBoxStub
 VBoxStub_TEMPLATE= VBOXSTUB
-VBoxStub_DEFS    = _WIN32_WINNT=0x0400 IN_RT_R3
+VBoxStub_DEFS    = _WIN32_WINNT=0x0501 IN_RT_R3
 VBoxStub_SOURCES = \
 	VBoxStub.cpp \