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-rw-r--r--sys/src/libfis/fis.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/src/libfis/fis.c b/sys/src/libfis/fis.c
index 61a464852..4d52e623a 100644
--- a/sys/src/libfis/fis.c
+++ b/sys/src/libfis/fis.c
@@ -432,7 +432,7 @@ rwfis(Sfis *f, uchar *c, int rw, int nsect, uvlong lba)
c[Flba24] = lba >> 24;
c[Flba32] = lba >> 32;
- c[Flba40] = lba >> 48;
+ c[Flba40] = lba >> 40;
c[Ffeat8] = 0;
c[Fsc] = nsect;