Problem comparing two Enum

[Khavoerm]

Hello,
For my program, I created an enum called Month. One the my function requiert a Month arguments and check if it is the current month. Here my function:

void CAgenda::SetMonth(enum Month NewMonth)
{
                Month curMonth = GetCurrentMonth();

    if(NewMonth != curMonth)
    {
        ...Some codes
    }
    else
    {
        ...Some codes
    }
} 

I get this error on line if(NewMonth != curMonth) :
error C2677: binary '!=' : no global operator defined which takes type 'enum Month' (or there is no acceptable conversion)

How could I compare the two Month?