diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index b15b188..1b04752 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -179,6 +179,8 @@
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_SPI_FLASH_SST=y
 CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_MULTIPLEXER=y
+CONFIG_MUX_MMIO=y
 CONFIG_DM_ETH=y
 CONFIG_NVME=y
 CONFIG_PCI=y