Shares of Walmart Inc. dropped in early trading Thursday, after the discount-retail behemoth missed fiscal second-quarter profit expectations, but raised its full-year outlook and saw strength in sales at both its retail and Sam’s Club warehouse stores.

The $100 level acted as support earlier in August. But since February, $100 has been a pretty strong resistance level. Now that WMT stock is below it once more, it is a worrying sign. Shares of Walmart rarely go on sale unless the market perceives a macro shock.

Retail giant Walmart is slated to report second-quarter earnings before markets open on Thursday, and investors see potential for shares to approach a record high in the days following.