diff --git a/boot/bootmeth_efi.c b/boot/bootmeth_efi.c
index 9ba7734911e..682cf5b23b7 100644
--- a/boot/bootmeth_efi.c
+++ b/boot/bootmeth_efi.c
@@ -339,7 +339,7 @@ static int distro_efi_read_bootflow_net(struct bootflow *bflow)
 	ret = env_set("bootp_vci", str);
 	if (ret)
 		return log_msg_ret("vcs", ret);
-	ret = env_set_ulong("bootp_arch", arch);
+	ret = env_set_hex("bootp_arch", arch);
 	if (ret)
 		return log_msg_ret("ars", ret);