Net profit of Australia-listed slot machine supplier Ainsworth Game Technology Ltd plunged by more than 50 percent in the first half of the financial year as a result of a one-time tax adjustment.

In a regulatory filing, Ainsworth announced on Tuesday that the company’s net profit from operations in the first half of fiscal 2018 tumbled to AUD9.7 million (US$7.6 million) from AUD$20.6 million (US$16.14 million) posted in H1 FY17.

On the other hand, Ainsworth’s total revenue for the six months to December 31, 2017, dropped 2 percent to AUD120.3 million ($94.3 million) from AUD$122.7 million ($96.18 million) for the six months to December 31, 2016.

The company attributed the dismal financial result to the one-off adjustment of AUD8.6 million ($6.74 million) in the first half of fiscal year 2017, which reflected “the reversal of previously-recognized deferred taxes resulting from the treatment of foreign currency movements.”