Referencing a function from outside as well as inside when creating a DLL

I am creating a DLL.

I have a function that will be referenced from outside as well as inside.

For it to be referenced from outside, I have used DLLEXPORT. But then the inside referenced don't link and conplain with LNK2001 error i.e. unresolved external symbol for that function.

How can I fix this situation? Please help!