diff --git a/configs/at91sam9g20ek_dataflash_cs1_defconfig b/configs/at91sam9g20ek_dataflash_cs1_defconfig
index 1eb4379..1e409ea 100644
--- a/configs/at91sam9g20ek_dataflash_cs1_defconfig
+++ b/configs/at91sam9g20ek_dataflash_cs1_defconfig
@@ -29,6 +29,8 @@
 CONFIG_OF_CONTROL=y
 CONFIG_DEFAULT_DEVICE_TREE="at91sam9g20ek"
 CONFIG_ENV_IS_IN_SPI_FLASH=y
+CONFIG_USE_ENV_SPI_MAX_HZ=y
+CONFIG_ENV_SPI_MAX_HZ=15000000
 CONFIG_DM=y
 CONFIG_CLK=y
 CONFIG_CLK_AT91=y