diff --git a/configs/Ainol_AW1_defconfig b/configs/Ainol_AW1_defconfig
index 9a18af8..89cad5d 100644
--- a/configs/Ainol_AW1_defconfig
+++ b/configs/Ainol_AW1_defconfig
@@ -15,6 +15,7 @@
 CONFIG_VIDEO_LCD_BL_PWM="PB2"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_SPL_I2C=y
+CONFIG_SYS_PBSIZE=1024
 CONFIG_SYS_I2C_MVTWSI=y
 CONFIG_SYS_I2C_SLAVE=0x7f
 CONFIG_SYS_I2C_SPEED=400000