Amazon has a leak problem. A banner ad spotted on the company's UK website Thursday inadvertently revealed the date of Amazon's 2018 Prime Day, a highly anticipated online shopping bonanza, TechRadar reports

The Prime member-only sales are scheduled to begin around midday on Monday, July 16, with the official Prime Day continuing through Tuesday, July 17. The sale is being billed as bigger and better than last year's, with 36 hours of reduced prices, longer than 2017's hugely popular 30-hour online shopping experience. The exact start time for this year's Prime Day has not yet been revealed. 

Amazon has updated its UK site to no longer display the July 16 date, and though the company's secret seems to already be out, Amazon isn't yet confirming that it slipped up and shared the actual date. "[W]e announced last year that Prime Day would return; we don't have additional details to share yet," the company said in a statement to USA Today.

Amazon Prime Day deals don't just matter to customers desperate to buy a discounted toaster. Last year, the made-up-shopping-holiday delivered record-breaking results for the e-commerce giant. However, individual sellers also saw a sizable payday, sellers reported seeing more than 60 percent growth in sales compared to 2016's Prime Day.

With even more hours to sell, the thousands of small businesses participating could see a further hike in sales this July on what will be the longest Prime day ever.