Index: /trunk/src/VBox/Installer/win/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Installer/win/Makefile.kmk	(revision 66036)
+++ /trunk/src/VBox/Installer/win/Makefile.kmk	(revision 66037)
@@ -671,4 +671,5 @@
 		-E 'VBOX_WITH_VRDP=$(if-expr defined(VBOX_WITH_VRDP) && !defined(VBOX_WITH_EXTPACK_PUEL),yes,no)' \
 		-E 'VBOX_WITH_WEBSERVICES=$(if $(VBOX_WITH_WEBSERVICES),yes,no)' \
+		-E 'VBOX_WITH_UNATTENDED=$(if $(VBOX_WITH_UNATTENDED),yes,no)' \
 		-E 'BUILD_TYPE=$(KBUILD_TYPE)' \
 		-E 'BUILD_TARGET_ARCH=$(KBUILD_TARGET_ARCH)' \