Walgreens CEO discusses the ongoing struggle with theft prevention in stores, citing locking items as ineffective.

Walgreens struggled financially last year, reporting an operating loss of $245 million for the quarter, compared to $39 million in the same quarter the previous year, according to Quartz. The company’s decision to lock up products was a response to a 52% increase in stolen inventory, but the method ultimately backfired.

Keeping products under lock and key dissuaded customers from purchasing them, Walgreens said in earnings call.