diff --git a/configs/at91sam9g10ek_dataflash_cs0_defconfig b/configs/at91sam9g10ek_dataflash_cs0_defconfig
index 00cbeeb..02cd5fa 100644
--- a/configs/at91sam9g10ek_dataflash_cs0_defconfig
+++ b/configs/at91sam9g10ek_dataflash_cs0_defconfig
@@ -1,6 +1,7 @@
 CONFIG_ARM=y
 CONFIG_ARCH_AT91=y
 CONFIG_TARGET_AT91SAM9261EK=y
+# CONFIG_MMC is not set
 CONFIG_SYS_EXTRA_OPTIONS="AT91SAM9G10,SYS_USE_DATAFLASH_CS0"
 CONFIG_BOOTDELAY=3
 # CONFIG_CONSOLE_MUX is not set