Starbucks announced a major change to its reward system. The coffee giant is making it a little harder to rack up Stars this summer, meaning it may take longer for rewards members to gain enough for a free drink. Starting June 24, the points received for using your own to-go reusable cup are changing, according to an email sent to rewards members.

Starbucks is changing its reward for customers who bring a personal reusable cup. It could mean fewer stars for customers who order single coffees.