Wal-Mart Stores Inc. says a tougher sales environment will hurt its revenue this fiscal year.

The retailer already warned investors in February that it would come in at the low end of its earlier forecast of 3 to 5 percent gains. Wal-Mart said Wednesday that it now expects its revenue will be up 2 to 3 percent over the prior fiscal year, when it generated $473.1 billion.