Chipotle reported a decline in second-quarter profit, citing a worse-than-expected fall in same-store sales. The Mexican restaurant chain reported $436.1 million in net income, or 32 cents a share, down from $455.7 million, or 33 cents a share, a year earlier. Adjusted earnings were 33 cents a share, matching analysts’ expectations.

Much of Chipotle’s revenue growth was driven by footprint expansion. Same-store sales for existing restaurants, however, declined 4% from a year ago.