Oops!

Prince Harry attended a meet-and-greet with World War II veterans on Thursday, June 2 — and was called out for not wearing a tie to the special event!

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Harry at the veterans event on June 2.

"I told him he should wear a bloody tie," Ivor Anderson, a 91-year-old sapper in the 591 Para Squadron Royal Engineers, joked, according to E! News. "I said I had a spare one. He said he couldn't wear mine because he didn't have his wings."

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"I was told not to wear a tie and then you all turn up wearing ties, I feel under-dressed," Harry — who previously served in the British military — said to John Phipps, the founder of charity D-Day Revisited. Now you know to dress up more next time, Harry!