http://lists.freedesktop.org/archives/fontconfig/2012-May/004071.html

<quote>
There is the font `dustismo_bold.ttf' (from openSuSE's `free-ttf-font'
package).  fc-scan gives the following output:

Pattern has 19 elts (size 32)
        family: "Dustismo"(s)
        familylang: "en"(s)
        style: " Bold"(s)
        stylelang: "en"(s)
        fullname: "Dustismo  Bold"(s)
        [...]

I think that fontconfig should remove the superfluous space so that
the style is `Bold'.
</quote>

Well, I think ideally it should be fixed/correct in the font though, we can have a workaround for that.