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-rw-r--r--lib/ext2fs/mmp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/ext2fs/mmp.c b/lib/ext2fs/mmp.c
index 91f4fb28..b27d9a42 100644
--- a/lib/ext2fs/mmp.c
+++ b/lib/ext2fs/mmp.c
@@ -127,7 +127,7 @@ errcode_t ext2fs_mmp_write(ext2_filsys fs, blk64_t mmp_blk, void *buf)
/* I was tempted to make this use O_DIRECT and the mmp_fd, but
* this caused no end of grief, while leaving it as-is works. */
- retval = io_channel_write_blk64(fs->io, mmp_blk, -fs->blocksize, buf);
+ retval = io_channel_write_blk64(fs->io, mmp_blk, -(int)sizeof(struct mmp_struct), buf);
#ifdef WORDS_BIGENDIAN
ext2fs_swap_mmp(mmp_s);