WASHINGTON (AP) -- Some homeowners who sign up for the government's mortgage assistance program are getting a nasty surprise: Lower credit scores.

For borrowers who are making their payments on time but are on the verge of default, the Obama administration's loan modification program can reduce their credit score as much as 100 points. That makes it harder to get a loan and can present a problem when applying for a new job.

Housing counselors say it's unfair, especially because the news often comes as a surprise to homeowners.

"Why should people's credit be hurt even worse when they're trying to do the right thing?" said Eileen Anderson, senior vice president at Community Development Corp. of Long Island, a housing counseling group in New York.

And many homeowners are angry that a program designed to help carries such a penalty, said Kathy Conley, a housing counselor with GreenPath Inc., a nonprofit group in Farmington Hills, Mich.