diff --git a/boards/arm/nrf5340dk_nrf5340/Kconfig.defconfig b/boards/arm/nrf5340dk_nrf5340/Kconfig.defconfig
index 8c3d55255a3..f04a905bdb7 100644
--- a/boards/arm/nrf5340dk_nrf5340/Kconfig.defconfig
+++ b/boards/arm/nrf5340dk_nrf5340/Kconfig.defconfig
@@ -16,6 +16,12 @@ config BOARD
 	default "nrf5340pdk_nrf5340_cpuapp" if BOARD_NRF5340PDK_NRF5340_CPUAPP || BOARD_NRF5340PDK_NRF5340_CPUAPPNS
 	default "nrf5340dk_nrf5340_cpuapp" if BOARD_NRF5340DK_NRF5340_CPUAPP || BOARD_NRF5340DK_NRF5340_CPUAPPNS
 
+# By default, if we build for a Non-Secure version of the board,
+# force building with TF-M as the Secure Execution Environment.
+
+config BUILD_WITH_TFM
+	default y if BOARD_NRF5340DK_NRF5340_CPUAPPNS || BOARD_NRF5340PDK_NRF5340_CPUAPPNS
+
 # Code Partition:
 #
 # For the secure version of the board the firmware is linked at the beginning