diff --git a/autoload/airline/highlighter.vim b/autoload/airline/highlighter.vim
index 249f2ee6..a1bf53a8 100644
--- a/autoload/airline/highlighter.vim
+++ b/autoload/airline/highlighter.vim
@@ -519,4 +519,7 @@ else
     s:separators[from .. to] = [from, to, inverse]
     s:exec_separator({}, from, to, inverse, '')
   enddef
+  def airline#highlighter#add_accent(accent: string): void # {{{2
+    s:accents[accent] = 1
+  enddef
 endif " }}}1