Losing your keys is frustrating but it’s worse when it costs a ton of cash.

USA Today reports.

Loss of master keys costs college $500K

The struggle is real at the College of William and Mary.

According to a Jan. 26 report by the college’s student newspaper, The Flat Hat, the college will have to pay more than $500,000 to replace keys and lock cores in numerous campus buildings after its set of master keys went missing last semester.

The keys gave William and Mary employees access to a number of campus buildings, including Greek houses and all residence halls except one. For security reasons, the Department of Facilities Management has started replacing 3,000 lock cores in affected dorms this semester, The Flat Hat reports.

.@williamandmary is launching a lock re-core project that will affect all residence halls except One Tribe Place. https://t.co/exew7pdaux

— The Flat Hat (@theflathat) January 28, 2016