diff --git a/libraries/AP_HAL_ChibiOS/Util.cpp b/libraries/AP_HAL_ChibiOS/Util.cpp
index e7e4b2d46e..80ced9910d 100644
--- a/libraries/AP_HAL_ChibiOS/Util.cpp
+++ b/libraries/AP_HAL_ChibiOS/Util.cpp
@@ -153,7 +153,8 @@ bool Util::toneAlarm_init()
     return true;
 }
 
-void Util::toneAlarm_set_buzzer_tone(float frequency, float volume) {
+void Util::toneAlarm_set_buzzer_tone(float frequency, float volume, uint32_t duration_ms)
+{
     if (is_zero(frequency) || is_zero(volume)) {
         pwmDisableChannel(_toneAlarm_pwm_group.pwm_drv, _toneAlarm_pwm_group.chan);
     } else {
diff --git a/libraries/AP_HAL_ChibiOS/Util.h b/libraries/AP_HAL_ChibiOS/Util.h
index 9fb8db9c60..31b7b00867 100644
--- a/libraries/AP_HAL_ChibiOS/Util.h
+++ b/libraries/AP_HAL_ChibiOS/Util.h
@@ -48,7 +48,7 @@ public:
     
 #ifdef HAL_PWM_ALARM
     bool toneAlarm_init() override;
-    void toneAlarm_set_buzzer_tone(float frequency, float volume) override;
+    void toneAlarm_set_buzzer_tone(float frequency, float volume, uint32_t duration_ms) override;
 #endif
 
 private: