United States Postal Service’s have a plan to escape the cost of their retiree pension plan, according to a new government report, but it comes at the expense of the already-embattled Medicare program.

“The primary policy decision for Congress to make with respect to USPS’s proposed health care plan is whether to increase postal retirees’ use of  Medicare, which is already facing funding challenges,” the Government Accountability Office reports. “This is because USPS’s proposal would essentially decrease USPS costs but increase Medicare costs.”