diff --git a/soc/nordic/nrf53/Kconfig.defconfig.nrf5340_CPUAPP_QKAA b/soc/nordic/nrf53/Kconfig.defconfig.nrf5340_CPUAPP_QKAA
index ab74bd6a9fb..ff8cdaf8b12 100644
--- a/soc/nordic/nrf53/Kconfig.defconfig.nrf5340_CPUAPP_QKAA
+++ b/soc/nordic/nrf53/Kconfig.defconfig.nrf5340_CPUAPP_QKAA
@@ -11,10 +11,6 @@ config NUM_IRQS
 config IEEE802154_NRF5
 	default IEEE802154
 
-config HEAP_MEM_POOL_ADD_SIZE_SOC
-	def_int 4096
-	depends on NRF_802154_SER_HOST
-
 if IPC_SERVICE_BACKEND_RPMSG
 
 config IPC_SERVICE_BACKEND_RPMSG_SHMEM_RESET
diff --git a/soc/nordic/nrf53/Kconfig.defconfig.nrf5340_CPUNET_QKAA b/soc/nordic/nrf53/Kconfig.defconfig.nrf5340_CPUNET_QKAA
index 41961784daf..3477c2372be 100644
--- a/soc/nordic/nrf53/Kconfig.defconfig.nrf5340_CPUNET_QKAA
+++ b/soc/nordic/nrf53/Kconfig.defconfig.nrf5340_CPUNET_QKAA
@@ -12,10 +12,6 @@ config IEEE802154_NRF5
 	default y
 	depends on IEEE802154
 
-config HEAP_MEM_POOL_ADD_SIZE_SOC
-	def_int 4096
-	depends on NRF_802154_SER_RADIO
-
 config LOG_DOMAIN_NAME
 	default "net"