diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
index 5821e9f04e89..59412729ad7e 100644
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -36,6 +36,15 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20210304: remove old bc and dc support and test files
+.if !defined(WITHOUT_GH_BC)
+OLD_FILES+=usr/share/misc/bc.library
+OLD_FILES+=usr/tests/usr.bin/dc/Kyuafile
+OLD_FILES+=usr/tests/usr.bin/dc/bcode
+OLD_FILES+=usr/tests/usr.bin/dc/inout
+OLD_DIRS+=usr/tests/usr.bin/dc
+.endif
+
 # 20210302: fmtree removed
 OLD_FILES+=usr/sbin/fmtree
 OLD_FILES+=usr/share/man/man8/fmtree.8.gz