ReSharper 755 Rename

I was working on some code today with Visual Studio 2008 and ReSharper
4.0.755 to rename an interface with usages similar to the following:

public interface IFoo
{
}

pubic class Bar
{
IFoo _foo;

public Bar(IFoo foo)
{
_foo = foo;
}
}

When I renamed IFoo to say IFood, ReSharper prompted with these recommended
usage changes:

_foo --> _Food
foo --> food

I have the field prefix set to "_" (without the quotes) in ReSharper options
and it's getting the names mostly right but with the wrong case.