diff --git a/meta-ast2400/recipes-bsp/u-boot/u-boot_%.bbappend b/meta-ast2400/recipes-bsp/u-boot/u-boot_%.bbappend
index ef6a709..e3cc9e2 100644
--- a/meta-ast2400/recipes-bsp/u-boot/u-boot_%.bbappend
+++ b/meta-ast2400/recipes-bsp/u-boot/u-boot_%.bbappend
@@ -1,3 +1,3 @@
-FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
+FILESEXTRAPATHS_prepend_ast2400 := "${THISDIR}/files:"
 
-SRC_URI += "file://fw_env.config"
+SRC_URI_append_ast2400 = " file://fw_env.config"