diff --git a/app/src/board/board_beep_ctrl.c b/app/src/board/board_beep_ctrl.c
index d88666d..1892875 100644
--- a/app/src/board/board_beep_ctrl.c
+++ b/app/src/board/board_beep_ctrl.c
@@ -11,7 +11,13 @@ static nrf_pwm_sequence_t const    m_beep_pwm0_seq        = {
               .end_delay           = 0,
 };
 static nrf_drv_pwm_config_t const m_beep_pwm0_config0 = {
-    .output_pins  = {BEEP_PIN},
+    .output_pins =
+        {
+            BEEP_PIN | NRF_DRV_PWM_PIN_INVERTED,  //
+            NRF_DRV_PWM_PIN_NOT_USED,
+            NRF_DRV_PWM_PIN_NOT_USED,
+            NRF_DRV_PWM_PIN_NOT_USED,
+        },
     .irq_priority = APP_IRQ_PRIORITY_LOWEST,
     .base_clock   = NRF_PWM_CLK_125kHz,
     .count_mode   = NRF_PWM_MODE_UP,