diff --git a/configs/alt_defconfig b/configs/alt_defconfig
index 6ab4fe7..1edcb2b 100644
--- a/configs/alt_defconfig
+++ b/configs/alt_defconfig
@@ -36,6 +36,7 @@
 CONFIG_SYS_SPI_U_BOOT_OFFS=0x140000
 CONFIG_SPL_YMODEM_SUPPORT=y
 CONFIG_HUSH_PARSER=y
+CONFIG_SYS_PBSIZE=256
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_XIMG is not set