diff --git a/Makefile b/Makefile
index 3ef74ff8e..fc67c0a20 100644
--- a/Makefile
+++ b/Makefile
@@ -71,7 +71,7 @@ asmprelaunch:
 	for f in res/TITLE.HGR/* res/TITLE.DHGR/*; do rsync --ignore-existing build/PRELAUNCH/STANDARD build/PRELAUNCH/$$(basename $$f); done
 
 chd:	dsk
-	chdman createhd -c none -isb 64 -i build/"$(DISK)" -o build/"$(DISK)".chd >>build/log
+	chdman createhd -c none -i build/"$(DISK)" -o build/"$(DISK)".chd >>build/log
 
 compress:
 	for f in res/ACTION.HGR.UNCOMPRESSED/*; do  o=res/ACTION.HGR/$$(basename $$f);  [ -f "$$o" ] || ${EXOMIZER} "$$f"@0x4000 -o "$$o" >>build/log; done
diff --git a/winmake.bat b/winmake.bat
index e61d283dd..815d11760 100644
--- a/winmake.bat
+++ b/winmake.bat
@@ -98,7 +98,7 @@ goto :EOF
 
 if "%1" equ "chd" (
 call :dsk
-chdman createhd -c none -isb 64 -i "build\%DISK%" -o "build\%DISK%.chd" >>build\log
+chdman createhd -c none -i "build\%DISK%" -o "build\%DISK%.chd" >>build\log
 goto :EOF
 )