diff --git a/nrf_802154/zephyr/Kconfig.nrfxlib b/nrf_802154/zephyr/Kconfig.nrfxlib
index 4a25e0b999..f49653d9a8 100644
--- a/nrf_802154/zephyr/Kconfig.nrfxlib
+++ b/nrf_802154/zephyr/Kconfig.nrfxlib
@@ -53,6 +53,14 @@ config NRF_802154_SL_HPTIMER
 
 endif # NRF_802154_SL
 
+config CONFIG_NRF_RTC_TIMER_USER_CHAN_COUNT_ADD_NRF_802154_RADIO_DRIVER
+	int
+	default 2 if NRF_802154_SL
+	default 0
+	help
+	  Additional requirements on nrf_rtc_timer user channels required by
+	  the nRF 802.15.4 Radio Driver.
+
 endif # NRF_802154_RADIO_DRIVER
 
 orsource "../internal/Kconfig.nrfxlib"