Assign std::vector

I have a std::vector<std::unique_ptr<MyClass>> and I am assigning this to a second vector of the same type.

I am getting this compiler error:

/opt/gcc-8.2.0/include/c++/8.2.0/bits/stl_algobase.h:324:18: error: use of deleted function 'std::unique_ptr<_Tp, _Dp>& std::unique_ptr<_Tp, _Dp>::operator=(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = MyClass; _Dp = std::default_delete<MyClass>]'
        *__result = *__first;

Is this because in order to do the assignment, I need to define a move assignment operator for MyClass? The class only contains a couple of unordered_maps, a set and a couple of primitives. No pointer members.