diff --git a/Ubiquitous/XiZi_AIoT/services/tools/mkfs/mkfs.h b/Ubiquitous/XiZi_AIoT/services/tools/mkfs/mkfs.h
index 8682e5ac8..3590334ab 100755
--- a/Ubiquitous/XiZi_AIoT/services/tools/mkfs/mkfs.h
+++ b/Ubiquitous/XiZi_AIoT/services/tools/mkfs/mkfs.h
@@ -48,6 +48,7 @@ Modification:
 
 #define ROOT_INUM 1 // root inode number
 #define BLOCK_SIZE 512 // block size
+#define BITMAP_SIZE 1024
 #define nr_blocks_total 8192 // total number of blocks (including used blocks and free blocks)
 #define nr_inodes 200 // total number of inodes