diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 18c8f168b153..055cdec2e9ad 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -1323,7 +1323,7 @@ xfs_seek_iomap_begin(
 	if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
 		if (data_fsb < cow_fsb + cmap.br_blockcount)
 			end_fsb = min(end_fsb, data_fsb);
-		xfs_trim_extent(&cmap, offset_fsb, end_fsb);
+		xfs_trim_extent(&cmap, offset_fsb, end_fsb - offset_fsb);
 		seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED);
 		error = xfs_bmbt_to_iomap(ip, iomap, &cmap, flags,
 				IOMAP_F_SHARED, seq);
@@ -1348,7 +1348,7 @@ xfs_seek_iomap_begin(
 	imap.br_state = XFS_EXT_NORM;
 done:
 	seq = xfs_iomap_inode_sequence(ip, 0);
-	xfs_trim_extent(&imap, offset_fsb, end_fsb);
+	xfs_trim_extent(&imap, offset_fsb, end_fsb - offset_fsb);
 	error = xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0, seq);
 out_unlock:
 	xfs_iunlock(ip, lockmode);