diff --git a/configs/riotboard_defconfig b/configs/riotboard_defconfig
index dbe4b50..15c1c5a 100644
--- a/configs/riotboard_defconfig
+++ b/configs/riotboard_defconfig
@@ -33,6 +33,7 @@
 CONFIG_SPL_FALCON_BOOT_MMCSD=y
 CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR=0x0
 CONFIG_SYS_MAXARGS=32
+CONFIG_SYS_PBSIZE=532
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y