Allocating memory for nested structure pointer

I am using a C code generator that is creating header files with following structures:

typdef struct Place {   
    struct Forest {
        int trees;
    } *Forest;
} Place ;

And using them in a c++ project.

When I try to access Place.Forest->trees, I get a segfault because Place.Forest is a dangling pointer.

I can't properly malloc it because:

Place.Forest = malloc(sizeof(Place.Forest));

Will just return the size of the pointer.

How do I allocate memory for Forest without changing Place or un-nesting Forest?

Modifying the structures is impracticable due to the large amount of code that is being automatically generated.