Hieron, Ellenberger now meet in Minneapolis
The promotion announced the news earlier today.
"UFC on FX 5" takes place on October 5 in Minneapolis, Minnesota.
This move is the first of what will be several after the UFC 151 fiasco, as the promotion scrambles to move the fights from that card to future events.
Ellenberger last competed this past June, losing to Martin Kampmann via technical knockout.
Meanwhile, Hieron is 11-1 in his last 12 fights. That lone loss came against Bellator welterweight champion Ben Askren.