02 Passat running lamps

I'm having a problem with the daytime running lamps on my 02 Passat. On the right side, the bulb won't stay in tight and eventually works it's way loose enough to go out. I've tried bending the retaining ring that holds the bulb in but to no avail. Has anyone had this problem, and if so, what can I  do to fix it? Is it a simple matter of replacing the retaining ring? Thanks for the help-