diff --git a/boards/arm/nrf53/nrf5340-dk/configs/rptun_cpuapp/defconfig b/boards/arm/nrf53/nrf5340-dk/configs/rptun_cpuapp/defconfig
index 54c67d60cb5..01fed5032f8 100644
--- a/boards/arm/nrf53/nrf5340-dk/configs/rptun_cpuapp/defconfig
+++ b/boards/arm/nrf53/nrf5340-dk/configs/rptun_cpuapp/defconfig
@@ -32,6 +32,7 @@ CONFIG_PREALLOC_TIMERS=4
 CONFIG_RAM_SIZE=524288
 CONFIG_RAM_START=0x20000000
 CONFIG_RAW_BINARY=y
+CONFIG_RPMSG_UART=y
 CONFIG_RPTUN=y
 CONFIG_RPTUN_LOCAL_CPUNAME="cpuapp"
 CONFIG_RPTUN_PING=y
diff --git a/boards/arm/nrf53/nrf5340-dk/configs/rptun_cpunet/defconfig b/boards/arm/nrf53/nrf5340-dk/configs/rptun_cpunet/defconfig
index df5a41632b4..89ecdad9079 100644
--- a/boards/arm/nrf53/nrf5340-dk/configs/rptun_cpunet/defconfig
+++ b/boards/arm/nrf53/nrf5340-dk/configs/rptun_cpunet/defconfig
@@ -32,6 +32,7 @@ CONFIG_PREALLOC_TIMERS=4
 CONFIG_RAM_SIZE=65535
 CONFIG_RAM_START=0x21000000
 CONFIG_RAW_BINARY=y
+CONFIG_RPMSG_UART=y
 CONFIG_RPTUN=y
 CONFIG_RPTUN_LOCAL_CPUNAME="cpunet"
 CONFIG_RPTUN_PING=y