diff --git a/Makefile b/Makefile
index 519d28a..2600c58 100644
--- a/Makefile
+++ b/Makefile
@@ -64,6 +64,7 @@ part.img: fat32.bs $(DISTFILES)
 	mformat -i $@ -F -B fat32.bs ::
 	mmd -i $@ ::rdos
 	mcopy -i $@ $(DISTFILES) ::rdos
+	mattrib -i $@ +s ::rdos ::rdos/kernel.bs
 
 clean:
 	rm -f *.com *.bs *.0 *.lst *.img *.bin *.rom