diff --git a/target/linux/xburst/image/Makefile b/target/linux/xburst/image/Makefile
index ed68c134d..e919168a7 100644
--- a/target/linux/xburst/image/Makefile
+++ b/target/linux/xburst/image/Makefile
@@ -7,6 +7,8 @@
 include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/image.mk
 
+JFFS2_BLOCKSIZE=256k 512k
+
 ifneq ($(CONFIG_XBURST_UBOOT),)
   define Build/Clean
 	$(MAKE) -C u-boot clean