Is this furigana a typo?


I have a set of traditional poem cards. One of the poems has the line:

> 嵐の庭の  
>  雪ならで

and furigana is given for the kanji. On the 庭 kanji, the furigana is には. My
dictionaries give にわ instead. Is this a typo, or is this something to do with
classical Japanese?

