Earlier this week the broadcaster revealed the identities of the eight feuding couples taking part in its latest dating format.
However, some observers pointed out that the line-up is noticeably lacking in minority participants.
C5 has now addressed the matter, acknowledging that it "must do better" in the future.
A spokesperson for the broadcaster told The Metro: "Channel 5 is fully committed to ensuring diversity across our slate of programming, on and off screen.
"We accept that the casting for this programme highlights that we can – and must – do better to represent and reflect the diversity and make-up of the UK population."
Make Or Break is thought to be C5's answer to Ex On The Beach, which airs on its sister channel MTV.
It sees the couples, all of whom are experiencing relationship problems, jet out to a luxury Mexican resort - where they will take part in challenges, behaviour workshops and sex therapy sessions.
The catch is that they must swap partners every two days - a twist that has invited comparisons to rival ITV2 show Love Island.
At the end of their tropical break, the original couples must reach a final 'make or break' decision regarding their relationships.
Make Or Break begins on Monday 7th August on C5, and will air stripped on weeknights at 10.00pm for two weeks.