This is a pretty common problem. If you can, try to slide the plastic sheath back to expose the female connector. Using pliers, gently squeeze the female connector to reduce the inner diameter by approximately 1/3 of the original diameter. Try to keep the female connector kind of round and try not to flatten it. This should be enough to secure the smaller male connector. If not, pinch it a little bit more to hold the male pin more securely. Slide the plastic sheath back on and you should be good to go. A couple of wraps of electrical tape may give you some additional peace of mind.