diff --git a/configs/inet_q972_defconfig b/configs/inet_q972_defconfig
index 1769256..73700b1 100644
--- a/configs/inet_q972_defconfig
+++ b/configs/inet_q972_defconfig
@@ -15,6 +15,7 @@
 CONFIG_VIDEO_LCD_BL_EN="PA25"
 CONFIG_VIDEO_LCD_BL_PWM="PH13"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_SYS_PBSIZE=1024
 CONFIG_AXP_DLDO1_VOLT=3300
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_OHCI_HCD=y