Federal Reserve Governor Lael Brainard said Wednesday that she is concerned that regulators may be “whittling away” at key financial stability measures by paring back post-crisis regulations. As the economic recovery creeps closer to earning the title of longest-on-record, Brainard also reiterated her worry that leveraged loans could bring the good times to an end.

In an exclusive interview on Yahoo Finance on Wednesday, Brainard said she is closely watching for risks to the banking system that could expose the government to another bailout, which would put “taxpayers on the hook.”

Although Congress passed legislation in May 2018 mandating that the Fed and other bank regulators reduce regulatory requirements on some portions of the banking industry (mostly smaller banks), Brainard has said she is worried that the Fed may have gone too far in extending those relief efforts to banks far larger in size.

“It's really in areas where we've gone beyond those statutory changes that I am concerned that we may be whittling away at that core resilience of our financial system,” Brainard told Yahoo Finance at the Fed Listens conference in Chicago.

For example, Brainard dissented on a decision to reduce the frequency for large banks to submit a “living wills” plan that details how a bank would wind down its assets in the event of financial distress or failure. The exercise is designed to make sure banks are able to address insolvency without triggering other failures throughout the rest of the banking industry.

Brainard voted against the proposal to reduce the annual submission to every four years for the largest banks — including JPMorgan Chase (JPM) and Bank of America (BAC) — and claimed that the change would “weaken protections that are vital to a safe and sound financial system.”

In addition to the living wills dissent, Brainard also disagreed with the board’s decision not to activate the countercyclical capital buffer, a temporary increase in capital requirements when an economy is at risk.

Brainard, the only sitting board member not to have been nominated to the Fed by President Donald Trump, has totaled five dissents in just the last year, making her an outlier on a Fed board that has largely expressed sympathy for tweaking post-crisis rules that some feel may have gone too far. Randal Quarles, who joined the board in October 2017, has largely spearheaded the regulatory changes at the Fed, arguing that the post-crisis framework would benefit from tailoring the rules to the different business models of different types of banks.