 Walters was given the nod ahead of Simon Cox in the crucial Play-off game against Estonia and Walters repaid by scoring his first international goal in the 4–0 victory over Estonia in Tallinn in the first leg of the UEFA Euro 2012 qualifying play-offs.On 26 March 2013, Walters scored two goals against Austria before a late strike from David Alaba gave the Austrians a 2–2 draw.Walters scored twice in a UEFA Euro 2016 play-off against Bosnia and Herzegovina on 16 November 2015 to earn Ireland a 2–0 victory and qualification to UEFA Euro 2016.