diff --git a/configs/sandbox64_defconfig b/configs/sandbox64_defconfig
index 634c195..cfda834 100644
--- a/configs/sandbox64_defconfig
+++ b/configs/sandbox64_defconfig
@@ -111,6 +111,8 @@
 CONFIG_DM_DEMO_SIMPLE=y
 CONFIG_DM_DEMO_SHAPE=y
 CONFIG_DFU_SF=y
+CONFIG_FASTBOOT_FLASH=y
+CONFIG_FASTBOOT_FLASH_MMC_DEV=0
 CONFIG_GPIO_HOG=y
 CONFIG_DM_GPIO_LOOKUP_LABEL=y
 CONFIG_PM8916_GPIO=y
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index a485b38..5bc90d0 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -137,6 +137,8 @@
 CONFIG_DMA=y
 CONFIG_DMA_CHANNELS=y
 CONFIG_SANDBOX_DMA=y
+CONFIG_FASTBOOT_FLASH=y
+CONFIG_FASTBOOT_FLASH_MMC_DEV=0
 CONFIG_GPIO_HOG=y
 CONFIG_DM_GPIO_LOOKUP_LABEL=y
 CONFIG_PM8916_GPIO=y