diff --git a/blog/content/edition-2/posts/04-testing/index.zh-CN.md b/blog/content/edition-2/posts/04-testing/index.zh-CN.md
index b40acd1c..fafcc653 100644
--- a/blog/content/edition-2/posts/04-testing/index.zh-CN.md
+++ b/blog/content/edition-2/posts/04-testing/index.zh-CN.md
@@ -989,7 +989,7 @@ harness = false
 #![no_main]
 
 use core::panic::PanicInfo;
-use blog_os::{QemuExitCode, exit_qemu, serial_println};
+use blog_os::{QemuExitCode, exit_qemu, serial_println, serial_print};
 
 #[no_mangle]
 pub extern "C" fn _start() -> ! {