NEW YORK (MarketWatch) — The Egg McMuffin isn’t just for breakfast anymore.

McDonald’s Corp. MCD, -1.03% confirmed Monday that it will make its breakfast menu available all day at some of its San Diego restaurants in April. Whether all-day breakfast sticks around and goes systemwide will be determined after the burger chain judges customer response.

“We know our customers love McDonald’s breakfast and they tell us they’d like to enjoy it beyond the morning hours,” McDonald’s said in an emailed statement to MarketWatch. “So next month, we will begin testing all-day breakfast at select restaurants in the San Diego area.”

McDonald’s has made it clear that it was urgently seeking ways to evolve to meet the changing needs and preferences of consumers, as it looks to revive flagging sales. Earlier this month, the company said it would stop selling chicken raised with antibiotics important to human health.

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McDonald’s has reported year-over-year declines in domestic same-store sales the past five quarters, and it missed expectations for total sales the last seven quarters, according to FactSet.

So why not give all-day breakfast a shot?

“We look forward to learning from this test, and it’s premature to speculate on any outcomes,” McDonald’s said.