&& Rhythmic_head::has_interface (info.grob ()))
{
if (to_boolean (get_property ("harmonicAccidentals"))
- || !ly_c_equal_p (info.grob ()->get_property ("style"),
+ || !ly_is_equal (info.grob ()->get_property ("style"),
ly_symbol2scm ("harmonic")))
{
Accidental_entry entry;