The twin-brothers

A traveler, on his way to a certain village, reaches a road junction, where he can turn left or right. He knows that only one of the two roads leads to village, but unfortunately, he does not know which one. Fortunately, he sees two twin-brothers standing at the road junction, and he decides to ask them for directions.

The traveler knows that one of the two brothers always tells the truth and the other one always lies. Unfortunately, he does not know which one always tells the truth and which one always lies.

Question:
How can the traveler find out the way to village by asking just "one" question to "one" of the two brothers?