China’s central bank is scrutinizing local enterprises’ big dollar purchases amid the depreciating Chinese yuan.

The People’s Bank of China (PBOC) met with commercial banks to approve purchases of $50 million or more.

The approval process will be extended due to the severe yuan depreciation, which many expect to fall below 7.5 per dollar.

The decision comes as the yuan has fallen 6% against the U.S. dollar this year, reaching 2008 global financial crisis levels.