American Express profits rose a modest 3% in the third quarter despite a significant rise in spending by cardmembers.

Revenue surged 24% to $13.56 billion, but profit its being curbed as the credit card giant sets aside hundreds of millions of dollars to cover potential credit losses in a volatile global economy.

Shares slumped 6% before the opening bell Friday.

The New York company earned $1.88 billion, or $2.47 a share, or a nickel better than Wall Street had expected, according to a survey by Zacks Investment Research. It’s also up from the $1.83 billion, or $2.27 a share, in the same period a year earlier.

Despite double digit increases in cardmember spending, new accounts opened, and healthy revenue, AmEx set aside $778 million to cover potential loan losses this quarter. That’s nearly double what larger banks like Citigroup, Wells Fargo and Bank of America reported putting in reserve when they reported quarterly results last week.

The company said the reason for the higher reserves was higher levels of loans provided by the company. AmEx has been moving to a more traditional business model encouraging card users to keep a balance — as well as the fact that even its well-to-do customers are getting hit by inflation.

“We have not seen changes in the spending behaviors of our customers, but we are mindful of the mixed signals in the broader economy and have plans in place to pivot should the operating environment change dramatically,” said CEO and Chairman Steve Squeri in a prepared statement.

Setting aside the cloudy economic forecast, AmEx’s cardmembers are having no problem spending on their cards. The company saw $394.4 million spent on its network last quarter, up 19% from a year earlier. Average cardmember spending was up 13% from a year earlier to $5,886.

The company now expects full-year earnings to be above its previous forecast of $9.25 to $9.65 per share, AP reports.