1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index c4487e177234..44549d706dcd 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2779,7 +2779,7 @@ u64 btrfs_csum_bytes_to_leaves(struct btrfs_root *root, u64 csum_bytes)
         u64 num_csums_per_leaf;
         u64 num_csums;
 
-        csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item);
+        csum_size = BTRFS_MAX_ITEM_SIZE(root);
         num_csums_per_leaf = div64_u64(csum_size,
                         (u64)btrfs_super_csum_size(root->fs_info->super_copy));
         num_csums = div64_u64(csum_bytes, root->sectorsize);