diff --git a/Makefile b/Makefile
index b486045..27faeb7 100644
--- a/Makefile
+++ b/Makefile
@@ -22,9 +22,11 @@ VOLUME=ANTI.M
 asm:
 	mkdir -p build
 	$(ACME) -r build/anti-m.lst src/anti-m.a
-	cp res/work.bin $(BUILDDISK)
+	cp res/work.bin "$(BUILDDISK)"
 	cp res/_FileInformation.txt build/ >>build/log
 	$(CADIUS) ADDFILE "$(BUILDDISK)" "/${VOLUME}/" "build/ANTI.M.SYSTEM" >>build/log
+	$(ACME) -r build/proboot.lst src/proboot.a
+	bin/changebootloader.py "$(BUILDDISK)" build/proboot
 
 clean:
 	rm -rf build/
diff --git a/bin/changebootloader.py b/bin/changebootloader.py
new file mode 100755
index 0000000..5ad571d
--- /dev/null
+++ b/bin/changebootloader.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+
+import sys
+import os.path
+
+target_disk_image, bootloader = sys.argv[1:]
+ext = os.path.splitext(target_disk_image)[-1].lower()
+assert(ext in (".dsk", ".do", ".po", ".2mg"))
+if ext == ".2mg":
+    offset = 64
+else:
+    offset = 0
+with open(bootloader, 'rb') as f:
+    boot = f.read()
+assert(len(boot) == 512)
+with open(target_disk_image, 'rb') as f:
+    data = bytearray(f.read())
+data[offset:offset+len(boot)] = boot
+with open(target_disk_image, 'wb') as f:
+    f.write(data)
diff --git a/res/work.bin b/res/work.bin
index c25e318..42b22ca 100644
Binary files a/res/work.bin and b/res/work.bin differ