C51: Pointer to array type

I have defined a type for objects we use. The details of the type should not be relevant for the users of the type, so I am "hiding" it behind a typedef. As it happens, this type is currently implemented as an array.
This is problematic when we want to pass around pointers to variables of this type.

Example:

#define OBJECT_SIZE 5

typedef char   object_t[OBJECT_SIZE];  // A type that happens to be an array

int main( void )
{
  object_t     my_object;
  object_t   * p_object;

  p_object = my_object;      // Compiler warning - pointer to different objects
                             // (Correct warning - array decays to pointer to char. )

  p_object = &my_object;     // Compiler warning - pointer to different objects
                             // Why this warning?
                             // According to knowledgeable people, this should be
                             // OK with respect to the C spec
  return 0;
}

So, the question is: how can I obtain the address of the variable in a way that will give me a pointer to the given type? That is, I need a pointer to array[OBJECT_SIZE] of char, not a plain pointer to char.

With kind regards
Asbj.S.