Index: /trunk/src/VBox/Additions/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Additions/Makefile.kmk	(revision 64937)
+++ /trunk/src/VBox/Additions/Makefile.kmk	(revision 64938)
@@ -264,5 +264,5 @@
 
 if defined(VBOX_WITH_ADDITIONS_ISO.win.amd64) || defined(VBOX_WITH_ADDITIONS_ISO.win.x86)
- ifdef VBOX_SIGNING_MODE
+ ifndef VBOX_SIGNING_MODE
   GUESTADDITIONS_FILESPEC.win =
  else if "$(VBOX_WITH_CORP_CODE_SIGNING)" == "all" || (!defined(VBOX_CERTIFICATE_SHA2_SUBJECT_NAME) && !defined(VBOX_WITH_CORP_CODE_SIGNING))