diff --git a/conf/machine/colibri-imx6.conf b/conf/machine/colibri-imx6.conf
index c808f81..977cd57 100644
--- a/conf/machine/colibri-imx6.conf
+++ b/conf/machine/colibri-imx6.conf
@@ -20,7 +20,7 @@ KERNEL_IMAGETYPE = "zImage"
 RRECOMMENDS:${KERNEL_PACKAGE_NAME}-base = ""
 
 IMX_DEFAULT_BOOTLOADER = "u-boot-toradex"
-PREFERRED_PROVIDER_u-boot-default-script = "u-boot-script-toradex"
+PREFERRED_PROVIDER_u-boot-default-script ?= "u-boot-script-toradex"
 
 UBOOT_SUFFIX = "img"
 SPL_BINARY = "SPL"