Index: /trunk/src/VBox/ValidationKit/bootsectors/Config.kmk
===================================================================
--- /trunk/src/VBox/ValidationKit/bootsectors/Config.kmk	(revision 59784)
+++ /trunk/src/VBox/ValidationKit/bootsectors/Config.kmk	(revision 59785)
@@ -86,7 +86,8 @@
 		-M -MP
 endef
-if "$(KBUILD_HOST)" == "darwin" \
- || "$(VBOX_NASM_allow_64_bit)" != ""
+if "$(VBOX_NASM_allow_64_bit)" != "" || "$(KBUILD_TARGET)" != "win"
  BS3KIT_NASM_allow_64_bit = --allow-64-bit
+else
+ BS3KIT_NASM_allow_64_bit = --allow-64bit-code-anywhere
 endif