diff --git a/Chapter8_SOC_与_Linux/8.8_设备驱动中的阻塞与非阻塞_IO.md b/Chapter8_SOC_与_Linux/8.8_设备驱动中的阻塞与非阻塞_IO.md
index 61d2b2e..e0042eb 100644
--- a/Chapter8_SOC_与_Linux/8.8_设备驱动中的阻塞与非阻塞_IO.md
+++ b/Chapter8_SOC_与_Linux/8.8_设备驱动中的阻塞与非阻塞_IO.md
@@ -207,7 +207,7 @@ struct demo_dev
     wait_queue_head_t w_wait;   // 阻塞写用的等待队列头
 };
 
-static unsigned int demo_poll(struct file *filp, struct poll_table* wait) {
+static unsigned int demo_poll(struct file *filp, struct poll_table_struct* wait) {
     struct demo_dev *devp = filp->private_data;
     unsigned int mask = 0;