Gaby made his international debut 16 August 2005 against Guinea coming on as a sub in a match that finished in a 3–1 win to DR Congo.
He was called up by the national squad for the 2013 African Cup of Nations and played his first match for DR Congo in over seven years coming on as a sub in a 2–2 draw with Ghana in the first group B match. He did not play in the second match but made his first start and played the full 90 minutes against Mali in the third. The match finished 1–1 but this wasn’t enough for DR Congo to qualify as they were eliminated in the group stages.
As at 17 January 2016 Gaby had won 14 caps.