diff --git a/UPDATING b/UPDATING
--- a/UPDATING
+++ b/UPDATING
@@ -27,6 +27,10 @@
 	world, or to merely disable the most expensive debugging functionality
 	at runtime, run "ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20250605:
+	"make delete-old" will now remove the fourth bootloader if the
+	system is built with WITHOUT_FOURTH.
+
 20250603:
 	LinuxKPI dma-mapping.h were pulled into the tree from drm-kmod.
 	Bump _FreeBSD_version to 1500045 to be able to detect this change.
diff --git a/tools/build/mk/OptionalObsoleteFiles.inc b/tools/build/mk/OptionalObsoleteFiles.inc
--- a/tools/build/mk/OptionalObsoleteFiles.inc
+++ b/tools/build/mk/OptionalObsoleteFiles.inc
@@ -1992,6 +1992,31 @@
 .endif
 
 .if ${MK_FORTH} == no
+OLD_FILES+=boot/beastie.4th
+OLD_FILES+=boot/brand-fbsd.4th
+OLD_FILES+=boot/brand.4th
+OLD_FILES+=boot/check-password.4th
+OLD_FILES+=boot/color.4th
+OLD_FILES+=boot/delay.4th
+OLD_FILES+=boot/efi.4th
+OLD_FILES+=boot/frames.4th
+OLD_FILES+=boot/loader_4th
+OLD_FILES+=boot/loader_4th.efi
+OLD_FILES+=boot/loader_4th.old
+OLD_FILES+=boot/loader.4th
+OLD_FILES+=boot/logo-beastie.4th
+OLD_FILES+=boot/logo-beastiebw.4th
+OLD_FILES+=boot/logo-fbsdbw.4th
+OLD_FILES+=boot/logo-orb.4th
+OLD_FILES+=boot/logo-orbbw.4th
+OLD_FILES+=boot/menu-commands.4th
+OLD_FILES+=boot/menu.4th
+OLD_FILES+=boot/menusets.4th
+OLD_FILES+=boot/screen.4th
+OLD_FILES+=boot/shortcuts.4th
+OLD_FILES+=boot/support.4th
+OLD_LIBS+=boot/userboot_4th.so
+OLD_FILES+=boot/version.4th
 OLD_FILES+=usr/share/man/man8/beastie.4th.8.gz
 OLD_FILES+=usr/share/man/man8/brand.4th.8.gz
 OLD_FILES+=usr/share/man/man8/check-password.4th.8.gz