diff --git a/src/bt.cpp b/src/bt.cpp
index 2954e75..fc76857 100644
--- a/src/bt.cpp
+++ b/src/bt.cpp
@@ -298,7 +298,7 @@ static void hci_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *p
         }
 
         case HCI_EVENT_DISCONNECTION_COMPLETE: {
-#ifndef ENABLE_SERIAL
+#if !ENABLE_SERIAL
             tud_disconnect();
 #endif
             gap_connectable_control(1);
@@ -347,7 +347,7 @@ static void l2cap_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t
                 }else if (size > 1){
                     is_dse = true;
                 }
-#ifndef ENABLE_SERIAL
+#if !ENABLE_SERIAL
                 tud_connect();
 #endif
             }
diff --git a/src/main.cpp b/src/main.cpp
index 9857a33..e4171a5 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -178,7 +178,7 @@ int main() {
         .speed = TUSB_SPEED_FULL
     };
     tusb_init(BOARD_TUD_RHPORT, &dev_init);
-#ifndef ENABLE_SERIAL
+#if !ENABLE_SERIAL
     tud_disconnect();
 #endif
     board_init_after_tusb();
@@ -192,7 +192,7 @@ int main() {
     }
     cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, false);
 
-#ifndef ENABLE_SERIAL
+#if !ENABLE_SERIAL
     if (watchdog_caused_reboot()) {
         printf("Rebooted by Watchdog!\n");
         // 当崩溃重启以后，闪三下灯
@@ -219,12 +219,12 @@ int main() {
 
     audio_init();
 
-#ifndef ENABLE_SERIAL
+#if !ENABLE_SERIAL
     watchdog_enable(1000, true);
 #endif
 
     while (1) {
-#ifndef ENABLE_SERIAL
+#if !ENABLE_SERIAL
         watchdog_update();
 #endif
         cyw43_arch_poll();