c typedef(ed) opaque pointer

I've defined an opaque structure and related APIs like this:

typedef struct foo foo;
foo *create_foo(...);
delete_foo(foo *f);

I am not able to define the structure in my c file. Gives redefinition error.

typedef struct foo {
   int implementation;
}foo;

I am able to use foo in c file without typedef but I want the typedef (i.e. use it directly as foo*). Is there a way?