diff --git a/configs/sandbox_flattree_defconfig b/configs/sandbox_flattree_defconfig
index e7657d4..8aa2956 100644
--- a/configs/sandbox_flattree_defconfig
+++ b/configs/sandbox_flattree_defconfig
@@ -44,6 +44,7 @@
 CONFIG_CMD_GPT=y
 CONFIG_CMD_IDE=y
 CONFIG_CMD_I2C=y
+CONFIG_CMD_MBR=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_OSD=y
 CONFIG_CMD_PCI=y