The man, who was a driver for the UN Women agency, passed away at the weekend in Sierra Leone and his spouse is currently receiving treatment, said spokesman Stephane Dujarric.
"All measures to protect staff at the duty station in Sierra Leone are being taken as best as possible under the current circumstances," said Dujarric.
A Sudanese national who worked as a UN health worker in Liberia died in Germany last week while a Liberian national died of probable Ebola last month.
A UN trust fund set up to provide quick funding to confront the Ebola emergency got a boost when Australia deposited USD 8.7 million and more pledges have come in.
Chile, Estonia, Finland, India, Kazakhstan, New Zealand, Norway and Romania have also offered contributions, bringing the total amount of pledges to USD 43.5 million. They will contribute to the fund.
UN Secretary General Ban Ki-moon last week caused a stir when he complained of having only USD 100,000 in cash on hand for the fund and urged nations to dig deep in their pockets.
