diff --git a/configs/porter_defconfig b/configs/porter_defconfig
index 046623e..7b78c68 100644
--- a/configs/porter_defconfig
+++ b/configs/porter_defconfig
@@ -36,6 +36,7 @@
 CONFIG_SYS_SPI_U_BOOT_OFFS=0x140000
 CONFIG_SPL_YMODEM_SUPPORT=y
 CONFIG_HUSH_PARSER=y
+CONFIG_SYS_CBSIZE=256
 CONFIG_SYS_PBSIZE=256
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMI is not set