[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/01/21/art.biden.gi.jpg caption="Biden couldn't pass up poking fun at Chief Justice Roberts last week."](CNN) — An aide to Vice President Joe Biden tells CNN he called Chief Justice John Roberts last week to apologize for a light-hearted remark he made over the flubbed Inauguration Day oath of office.
"My memory is not as good as Justice Roberts, Chief Justice Roberts," Biden said last Wednesday, as he asked for a copy of the oath he was using to swear in senior members of the White House staff.
Several staffers reacted to the comment with groans and laughter, though President Obama, standing next to Biden, did not crack a smile.
An aide to the vice president said Tuesday the two men spoke privately after that comment. “They spoke and had a good conversation,” said the aide, who declined to give further details.
Roberts' mistake came about half way through the 35-word oath, when, reciting from memory, he said the word 'faithfully,' out of order. The flub confused Obama who ultimately repeated the mistake.
Meanwhile, Biden has been selected to handle the administration’s first foreign trip. The White House said Tuesday the vice president will travel to Germany next week with retired Gen. James Jones, Assistant to the President for National Security Affairs.
Biden will represent the United States at the Wehrkunde, the annual security policy conference held in Munich.
–CNN's Ed Henry contributed to this report