Millie Bobby Brown is terrified that she will break the fourth wall when filming for the upcoming season of “Stranger Things” — something her character does all the time on “Enola Holmes.”

“While filming, I had a dream that I was on the set of ‘Stranger Things,’ and I couldn’t stop looking at the camera. And now, I have this deep-rooted fear that now I will never stop looking at the camera,” the young actress said during a Q&A panel at the New York premiere of “Enola Holmes 2,”

“So now, I’m so obsessed with it.”

In the Sherlock Holmes spin-off, Brown plays a young detective who will often talk to the camera when she makes new discoveries in her cases, which the 18-year-old describes as “vlogging on YouTube all day long.”

“It’s like, ‘Come along with me on another journey. I wake up. I go on another case,’ I mean, it’s amazing,” she noted.

Her newfound fear isn’t the only thing Brown discovered when filming the Netflix movie. In fact, she had previously talked about the close bond she has formed with Henry Cavill, 39, who plays her brother.

“With Henry, it feels like a real adult relationship. Like a really good friendship, a really healthy one. One that we have terms and conditions,” Brown said in a recent interview.

“I know Henry. He has terms and conditions with me. I’m not allowed to ask about his personal life. It’s like, ‘Millie, shut up. No.’ And I’m like, ‘Understood.’”

Her relationship with the “Superman” star is quite different from the teasing ones she shares with her “Stranger Things” co-stars, including Caleb McLaughlin, Noah Schnapp, Gaten Matarazzo, and Finn Wolfhard.

In fact, Brown and Schnapp have a pact that they will get married if they’re 40 years old and still single.