C++ :: How To Save File Directory To Text File Using Ofstream

I'm having a little problem with std:fstream - in my program, the user selects the location of a file which I want to remember. So, I have something like this:

Code: std::string fileLocation;
//Code here creates an 'open file' dialog box which lets the user choose which file to open.
//The string 'fileLocation' now contains the path to the chosen file.
std::ofstream prefs("prefs.txt");
if (prefs.is_open())
{
prefs << fileLocation;
prefs.close();
}

This works fine if the file chosen is in the same directory as the program, however, if they try to choose a directory outside of where the program is kept, it saves the text file into that directory instead of the same one as the program. So, it looks like outputting a directory into an ofstream actually changes the location to which the file is saved.

Is there a way to save the file directory to a text file using ofstream and still have the text file save in the same directory as the program?