templates used on map container

[System_Error]

I've got the following code:

template <typename T> int Histogram<T>::get_occurances(const T& obj)
{
         map<T,int>::iterator find_occur = frequency.find(obj);
         
         if ( find_occur == this->frequency.end() )
         {
            return 0;
         }
         
         return ( find_occur->second );
}

The following line always gives me an error saying ';' expected before find_occur.

map<T,int>::iterator find_occur = frequency.find(obj);

If I change the first argument of the map to something other than T, then it works fine, but I need the template type. Is there something I'm doing wrong?