N.H. Rev. Stat. Ann. § 601:8

No indictment, complaint, return, process, judgment or other proceeding in any criminal case in the courts or course of justice shall be abated, quashed or reversed for any error or mistake where the person or case may be rightly understood by the court, nor through any defect or want of form or addition, and courts and justices may, on motion, order amendments in any such case.