diff --git a/fsck/mount.c b/fsck/mount.c
index 73eba6b..6d96db8 100644
--- a/fsck/mount.c
+++ b/fsck/mount.c
@@ -221,12 +221,15 @@
 		return -1;
 	}
 
-	if (F2FS_LOG_SECTOR_SIZE != le32_to_cpu(raw_super->log_sectorsize)) {
+	if (le32_to_cpu(raw_super->log_sectorsize) > F2FS_MAX_LOG_SECTOR_SIZE ||
+		le32_to_cpu(raw_super->log_sectorsize) <
+						F2FS_MIN_LOG_SECTOR_SIZE) {
 		return -1;
 	}
 
-	if (F2FS_LOG_SECTORS_PER_BLOCK !=
-				le32_to_cpu(raw_super->log_sectors_per_block)) {
+	if (le32_to_cpu(raw_super->log_sectors_per_block) +
+				le32_to_cpu(raw_super->log_sectorsize) !=
+						F2FS_MAX_LOG_SECTOR_SIZE) {
 		return -1;
 	}
 
diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index e7fb8fa..6ce58c2 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -289,8 +289,8 @@
  * Copied from include/linux/f2fs_sb.h
  */
 #define F2FS_SUPER_OFFSET		1024	/* byte-size offset */
-#define F2FS_LOG_SECTOR_SIZE		9	/* 9 bits for 512 byte */
-#define F2FS_LOG_SECTORS_PER_BLOCK	3	/* 4KB: F2FS_BLKSIZE */
+#define F2FS_MIN_LOG_SECTOR_SIZE	9	/* 9 bits for 512 bytes */
+#define F2FS_MAX_LOG_SECTOR_SIZE	12	/* 12 bits for 4096 bytes */
 #define F2FS_BLKSIZE			4096	/* support only 4KB block */
 #define F2FS_MAX_EXTENSION		64	/* # of extension entries */
 #define F2FS_BLK_ALIGN(x)	(((x) + F2FS_BLKSIZE - 1) / F2FS_BLKSIZE)