diff --git a/package/boot/uboot-imx/Makefile b/package/boot/uboot-imx/Makefile
index c23e48732b2..ade26db7686 100644
--- a/package/boot/uboot-imx/Makefile
+++ b/package/boot/uboot-imx/Makefile
@@ -39,7 +39,7 @@ endef
 define U-Boot/pico-pi-imx7d
   NAME:=TechNexion PICO-PI-IMX7D
   UBOOT_IMAGE:=SPL u-boot-dtb.img
-  UBOOT_MAKE_FLAGS:=SPL u-boot-dtb.img
+  UBOOT_MAKE_FLAGS+=SPL u-boot-dtb.img
   BUILD_SUBTARGET:=cortexa7
   BUILD_DEVICES:=technexion_imx7d-pico-pi
 endef