diff --git a/ch2/os/Makefile b/ch2/os/Makefile
index adb85bb..faf1758 100644
--- a/ch2/os/Makefile
+++ b/ch2/os/Makefile
@@ -32,7 +32,7 @@ debug:build_elf $(KERNEL_BIN) $(SYMBOL_MAP) kill
 		-machine virt \
 		-display none \
 		-daemonize \
-		-bios ../bootloader/rustsbi-qemu.bin \
+		-bios ../../bootloader/rustsbi-qemu.bin \
 		-device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY) \
 		-s -S
 
@@ -40,7 +40,7 @@ run:build_elf $(KERNEL_BIN) $(SYMBOL_MAP) kill
 	$(QEMU_CMD_PATH) \
 		-machine virt \
 		-nographic \
-		-bios ../bootloader/rustsbi-qemu.bin \
+		-bios ../../bootloader/rustsbi-qemu.bin \
 		-device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY)
 
 clean: