diff --git a/Makefile b/Makefile
index 68877d7..cd8dcda 100644
--- a/Makefile
+++ b/Makefile
@@ -57,7 +57,7 @@ fat6.bs: boot/fat.asm
 	$(NASM) $(NASM_ARGS) -o $@ $< && utils/fix-rom $@
 
 fd%.img: fat1.bs $(DISTFILES)
-	mformat -C -i $@ -f $* -R 8 -v "$(LABEL)" -B fat1.bs ::
+	mformat -C -i $@ -f $* -v "$(LABEL)" -B fat1.bs ::
 	mcopy      -i $@ $(DISTFILES) ::
 	mattrib    -i $@ +s ::kernel.bs