Iga Swiatek, the No. 2 ranked women's tennis player in the world, has accepted a one-month suspension for violating the Tennis Anti-Doping Program, the International Tennis Integrity Agency announced on Thursday.

Swiatek, 23, tested positive in August for a banned heart medication. She blamed it on the sleeping medicine melatonin.

Meanwhile, Swiatek was found to have been “at the lowest end of the range for no significant fault or negligence” after the 23-year-old Polish player explained that her doping violation was caused by a contaminated supply of the non-prescription medication melatonin, which she uses to help with jet lag and sleep issues.