diff --git a/tools/build/mk/OptionalObsoleteFiles.inc b/tools/build/mk/OptionalObsoleteFiles.inc
index c1b46f435063..e8c4bedebc06 100644
--- a/tools/build/mk/OptionalObsoleteFiles.inc
+++ b/tools/build/mk/OptionalObsoleteFiles.inc
@@ -2480,9 +2480,7 @@ OLD_FILES+=usr/share/man/man8/gpioctl.8.gz
 .endif
 
 .if ${MK_GNU_DIFF} == no
-OLD_FILES+=usr/bin/diff
 OLD_FILES+=usr/bin/diff3
-OLD_FILES+=usr/share/man/man1/diff.1.gz
 OLD_FILES+=usr/share/man/man1/diff3.1.gz
 OLD_FILES+=usr/share/man/man7/diff.7.gz
 .endif