diff --git a/Source/Makefile b/Source/Makefile
index 7c69b6f0..816021f3 100644
--- a/Source/Makefile
+++ b/Source/Makefile
@@ -10,7 +10,6 @@ SUBDIRS += ZPM3
 SUBDIRS += Forth
 NOTDONE += Fonts
 SUBDIRS += BPBIOS
-SUBDIRS += HBIOS
 SUBDIRS += Images
 TOOLS = ../Tools
 include $(TOOLS)/Makefile.inc