diff --git a/conf/machine/jetson-orin-nano-devkit.conf b/conf/machine/jetson-orin-nano-devkit.conf
index 4ffbd5ac..76a1939e 100644
--- a/conf/machine/jetson-orin-nano-devkit.conf
+++ b/conf/machine/jetson-orin-nano-devkit.conf
@@ -6,5 +6,6 @@ require conf/machine/include/orin-nano.inc
 require conf/machine/include/devkit-wifi.inc
 
 TEGRA_SPIFLASH_BOOT ?= "1"
+TNSPEC_BOOTDEV_DEFAULT ?= "mmcblk1p1"
 TEGRAFLASH_SDCARD_SIZE ?= "32G"
 PARTITION_LAYOUT_TEMPLATE_DEFAULT ?= "flash_t234_qspi_sd.xml"