diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 6e9f029cc9..5ceff7d297 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -102,6 +102,7 @@ CONFIG_ENV_IS_NOWHERE=y
 CONFIG_ENV_IS_IN_EXT4=y
 CONFIG_ENV_EXT4_INTERFACE="host"
 CONFIG_ENV_EXT4_DEVICE_AND_PART="0:0"
+CONFIG_PROT_UDP=y
 CONFIG_BOOTP_SEND_HOSTNAME=y
 CONFIG_NETCONSOLE=y
 CONFIG_IP_DEFRAG=y