diff --git a/pkgs/misc/uboot/default.nix b/pkgs/misc/uboot/default.nix
index f8f3df665d4a..6c59c13d12e2 100644
--- a/pkgs/misc/uboot/default.nix
+++ b/pkgs/misc/uboot/default.nix
@@ -192,6 +192,7 @@ in {
       platforms = ["aarch64-linux"];
       license = lib.licenses.unfreeRedistributableFirmware;
     };
+    BL31="${armTrustedFirmwareRK3399}/bl31.elf";
     filesToInstall = ["u-boot.itb" "idbloader.img"];
     postBuild = ''
       ./tools/mkimage -n rk3399 -T rksd -d ${rkbin}/rk33/rk3399_ddr_800MHz_v1.24.bin idbloader.img