diff --git a/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat
index 1d86ac1158..eb7625b126 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat
@@ -43,7 +43,7 @@ PA13 JTMS-SWDIO SWD
 PA14 JTCK-SWCLK SWD
 
 PE0 LED0 OUTPUT LOW
-PD15 BUZZER OUTPUT
+PD15 TIM4_CH4 TIM4 GPIO(57) ALARM
 
 # ICM-20608 on SPI1
 PA4 MPU6000_CS CS