Index: /trunk/src/VBox/Devices/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Devices/Makefile.kmk	(revision 33036)
+++ /trunk/src/VBox/Devices/Makefile.kmk	(revision 33037)
@@ -432,4 +432,8 @@
 endif
 
+ifdef VBOX_WITH_MSI_DEVICES
+ DevicesR3_DEFS        += VBOX_WITH_MSI_DEVICES
+endif
+
 ifdef VBOX_WITH_DYNAMIC_DSDT
  DevicesR3_DEFS        += VBOX_WITH_DYNAMIC_DSDT