diff --git a/configs/nanopi_r1s_h5_defconfig b/configs/nanopi_r1s_h5_defconfig
index 27cf172..9d0a4d7 100644
--- a/configs/nanopi_r1s_h5_defconfig
+++ b/configs/nanopi_r1s_h5_defconfig
@@ -9,6 +9,7 @@
 CONFIG_MACPWR="PD6"
 CONFIG_MMC_SUNXI_SLOT_EXTRA=2
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_SYS_PBSIZE=1024
 CONFIG_SUN8I_EMAC=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_OHCI_HCD=y