diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 9ce620085467..61b5594c4206 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2293,7 +2293,7 @@ static noinline int run_delalloc_nocow(struct btrfs_inode *inode,
 static bool should_nocow(struct btrfs_inode *inode, u64 start, u64 end)
 {
 	if (inode->flags & (BTRFS_INODE_NODATACOW | BTRFS_INODE_PREALLOC)) {
-		if (inode->defrag_bytes &&
+		if (data_race(inode->defrag_bytes) &&
 		    btrfs_test_range_bit_exists(&inode->io_tree, start, end, EXTENT_DEFRAG))
 			return false;
 		return true;