diff --git a/rt-thread-version/rt-thread-standard/programming-manual/ipc1/ipc1.md b/rt-thread-version/rt-thread-standard/programming-manual/ipc1/ipc1.md
index db05e5c96ee2092ace13ed38abc72efef49d6c4e..818f6c9a7d4356e47b35066a105543319c586fa1 100644
--- a/rt-thread-version/rt-thread-standard/programming-manual/ipc1/ipc1.md
+++ b/rt-thread-version/rt-thread-standard/programming-manual/ipc1/ipc1.md
@@ -934,7 +934,7 @@ static void thread3_entry(void *parameter)
 int pri_inversion(void)
 {
     /* 创建互斥锁 */
-    mutex = rt_mutex_create("mutex", RT_IPC_FLAG_FIFO);
+    mutex = rt_mutex_create("mutex", RT_IPC_FLAG_PRIO);
     if (mutex == RT_NULL)
     {
         rt_kprintf("create dynamic mutex failed.\n");