Thousands of women are missing out on over £2,500 a year - and all it takes is a phone call to cash in.
Almost 100,000 women who claim the state pension are going without a maximum of £2,821 year because of a little known rule.
All it takes to pick up the phone to claim what you might well be rightfully owed.
The rewards will be worth it, with as much as £54.25 a week being added to your pension as a result.
As The Mirror reported, the problem surrounds women who got divorced after the age of 60 and was highlighted by former pensions minister Sir Steve Webb.
Webb, now a partner at pensions consultants Lane Clark & Peacock, said: “Every year thousands of women over state pension age get divorced, but many may not be aware that they can qualify for a state pension boost as a result.
"Worryingly even some financial advisers, lawyers and DWP call handlers seem to be unaware of the rules."
To qualify for the uplift, you need to have reached state pension age before April 6 2016.
If you started claiming when you were married, but subsequently divorced, you could be in line for the full state pension of £134.25 rather than the "married woman’s rate" of just £80.45.
If you broke up after you started claiming, you should let the DWP so they can check your circumstances.
Webb added: "Any woman who reached pension age before April 6 2016 and has since got divorced should contact the DWP if she is not on a full basic state pension to see if she is entitled to an increase based on her ex-husband's contributions."
A DWP spokesman said it has dedicated teams that check pension entitlements.
In a statement to the Mirror they said: "It is important that individuals report to us any change of circumstances that may affect their state pension entitlement.
"As a reminder, we include information on this in the leaflet that accompanies the uprating notifications we send to pensioners every year. We would encourage anyone who thinks they have failed to claim a state pension increase they are eligible for to contact the Department.
"DWP have dedicated, trained teams for handling all contacts from customers asking us to check their pension entitlement."