diff --git a/disk-io.c b/disk-io.c
index fbce506a..3647ecca 100644
--- a/disk-io.c
+++ b/disk-io.c
@@ -125,7 +125,7 @@ u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
 
 void btrfs_csum_final(u32 crc, char *result)
 {
-	*(__le32 *)result = ~cpu_to_le32(crc);
+	put_unaligned_le32(~crc, result);
 }
 
 static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,