How do I fix the piece where the headphone fold in?

How do I fix the piece where the headphone fold in? On the left side of the headphone, when I unfold the headphone to use them they click in place. When I fold the sides over each other to not use them, the very small piece in the corner on one side is broken off causing the whole left headphone to rotate and dangle off. How do i fix it? ANSWERS:
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