diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 02534bf..d69c9fc 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -28,6 +28,7 @@
 CONFIG_DEVRES=y
 CONFIG_ADC=y
 CONFIG_ADC_SANDBOX=y
+CONFIG_BLK=y
 CONFIG_CLK=y
 CONFIG_SANDBOX_GPIO=y
 CONFIG_SYS_I2C_SANDBOX=y