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
@@ -883,6 +883,7 @@
 OLD_FILES+=usr/lib/dtrace/errno.d
 OLD_FILES+=usr/lib/dtrace/io.d
 OLD_FILES+=usr/lib/dtrace/ip.d
+OLD_FILES+=usr/lib/dtrace/ipfw.d
 OLD_FILES+=usr/lib/dtrace/mbuf.d
 OLD_FILES+=usr/lib/dtrace/psinfo.d
 .if ${TARGET_ARCH} == "amd64" || ${TARGET_ARCH} == "i386"