diff --git a/configs/colibri_imx7_defconfig b/configs/colibri_imx7_defconfig
index d2051a5..2f61223 100644
--- a/configs/colibri_imx7_defconfig
+++ b/configs/colibri_imx7_defconfig
@@ -18,7 +18,7 @@
 CONFIG_BOOTDELAY=1
 CONFIG_BOOTCOMMAND="run ubiboot ; echo ; echo ubiboot failed ; run distro_bootcmd;"
 CONFIG_USE_PREBOOT=y
-CONFIG_PREBOOT="setenv fdtfile ${soc}-colibri-${fdt_board}.dtb "
+CONFIG_PREBOOT="test -n ${fdtfile} || setenv fdtfile ${soc}-colibri-${fdt_board}.dtb "
 # CONFIG_CONSOLE_MUX is not set
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 # CONFIG_DISPLAY_BOARDINFO is not set