diff --git a/fs/zonefs/file.c b/fs/zonefs/file.c
index 738b0e28d74b5..a545a6d9a32ef 100644
--- a/fs/zonefs/file.c
+++ b/fs/zonefs/file.c
@@ -383,7 +383,7 @@ static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
 	struct block_device *bdev = inode->i_sb->s_bdev;
 	unsigned int max = bdev_max_zone_append_sectors(bdev);
 	struct bio *bio;
-	ssize_t size;
+	ssize_t size = 0;
 	int nr_pages;
 	ssize_t ret;