diff --git a/target/linux/au1000/image/Makefile b/target/linux/au1000/image/Makefile
index 3cdd83e589..062d613144 100644
--- a/target/linux/au1000/image/Makefile
+++ b/target/linux/au1000/image/Makefile
@@ -11,6 +11,8 @@ LOADADDR = 0x81000000		# RAM start + 16M
 KERNEL_ENTRY = 0x80100000
 RAMSIZE = 0x00100000		# 1MB
 
+JFFS2_BLOCKSIZE = 128k
+
 FLASH_KERNEL := 0xBFD00000
 FLASH_FS     := 0xBE000000