diff --git a/nametag8_CH592/user/hw/ch32sub.c b/nametag8_CH592/user/hw/ch32sub.c
index c74f731..c0b7c95 100644
--- a/nametag8_CH592/user/hw/ch32sub.c
+++ b/nametag8_CH592/user/hw/ch32sub.c
@@ -87,7 +87,7 @@ void ch32sub_process()
         for (i = 0; i < 8; i++) {
             if (flags & (1 << i)) {
                 if (intr_cb[i]) {
-                    clear |= (i << 1);
+                    clear |= (1 << i);
                     intr_cb[i]();
                 }
                 else {