diff --git a/configs/Cubieboard2_defconfig b/configs/Cubieboard2_defconfig
index ef95ac6a5e..7565786648 100644
--- a/configs/Cubieboard2_defconfig
+++ b/configs/Cubieboard2_defconfig
@@ -19,3 +19,4 @@ CONFIG_SUN7I_GMAC=y
 CONFIG_SCSI=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_OHCI_HCD=y
+CONFIG_MMC_SUNXI_SLOT_EXTRA=2
diff --git a/configs/Cubietruck_defconfig b/configs/Cubietruck_defconfig
index f9f73fdb23..ecb4f2f24e 100644
--- a/configs/Cubietruck_defconfig
+++ b/configs/Cubietruck_defconfig
@@ -30,3 +30,4 @@ CONFIG_SCSI=y
 CONFIG_SCSI=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_MUSB_GADGET=y
+CONFIG_MMC_SUNXI_SLOT_EXTRA=2