diff --git a/samples/net/zperf/Kconfig b/samples/net/zperf/Kconfig
index 795613f1a49..a476a9fec3f 100644
--- a/samples/net/zperf/Kconfig
+++ b/samples/net/zperf/Kconfig
@@ -1,8 +1,6 @@
 # Copyright 2023 NXP
 # SPDX-License-Identifier: Apache-2.0
 
-source "Kconfig.zephyr"
-
 config NET_SAMPLE_CODE_RELOCATE
 	bool "Relocate networking code into RAM"
 	select CODE_DATA_RELOCATION
@@ -27,3 +25,9 @@ if USB_DEVICE_STACK_NEXT
 # tree, you cannot use them in your own application.
 	source "samples/subsys/usb/common/Kconfig.sample_usbd"
 endif
+
+configdefault NRF_WIFI_DATA_HEAP_SIZE
+	default 30000 if NRF_WIFI_ZERO_COPY_TX
+	default 50000
+
+source "Kconfig.zephyr"
diff --git a/samples/net/zperf/boards/nrf7002dk_nrf5340_cpuapp.conf b/samples/net/zperf/boards/nrf7002dk_nrf5340_cpuapp.conf
index 2b7f5e48de1..8907ee8fbbd 100644
--- a/samples/net/zperf/boards/nrf7002dk_nrf5340_cpuapp.conf
+++ b/samples/net/zperf/boards/nrf7002dk_nrf5340_cpuapp.conf
@@ -4,7 +4,6 @@ CONFIG_NET_PKT_TX_COUNT=28
 CONFIG_NET_BUF_RX_COUNT=28
 CONFIG_NET_BUF_TX_COUNT=28
 CONFIG_NRF70_RX_NUM_BUFS=16
-CONFIG_NRF_WIFI_DATA_HEAP_SIZE=30000
 CONFIG_NET_PKT_BUF_TX_DATA_POOL_SIZE=20000
 CONFIG_NRF70_MAX_TX_AGGREGATION=4
 CONFIG_NRF70_QSPI_LOW_POWER=n