The 40-year-old actor, born in Greenock, appeared on a recent episode of Lorraine to discuss his new Prime Video thriller, Fear.
While on the show, the host noticed him fiddling with his wedding ring, and realised it was made of rubber, The Scottish Sun reports.
READ MORE: Martin Compston makes hilarious Rangers father-in-law admission
Martin, who married American actress Tianna Flynn in 2016, responded to Lorraine’s query about the unusual choice of wedding band.
He said: “In this job, you have to take it off quite a lot. I actually lost my wedding ring.
READ MORE: Celtic star on Glaswegian slang, Irn-Bru, and favourite restaurant
“It wasn’t expensive anyway and I’ve got about 20 of these rubber ones. If you lose them, it’s fine.
“My wife and I got matching tattoos and I feel like that’s my wedding ring. It’s the only one I’ve got and the only one I will get.”
READ MORE: Investigation launched after elderly women robbed in Kilmarnock
The actor also provided an update on the return of the much-loved BBC drama, Line of Duty, in which he stars alongside Vicky McClure and Adrian Dunbar.
He said: “We’re very aware of getting people’s hopes up. You have to wait to hear it from me, Vicky, Adrian or most importantly, show creator Jed.
“I think it does so well because we don’t come back just for the sake of it, Jed only comes back when he thinks there’s a story to tell.
“I’m sure he’s got something somewhere.”