diff --git a/src/ChangeLog b/src/ChangeLog
index 036d540a015..e5b46615fcc 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,7 @@
 2009-03-11  Kenichi Handa  <handa@m17n.org>
 
+	* font.h (font_open_by_spec): Extern it.
+
 	* font.c (font_open_by_spec): New function.
 	(font_open_by_name): Use font_open_by_spec.
 
diff --git a/src/font.h b/src/font.h
index 6a3c9e70d14..b481c31a132 100644
--- a/src/font.h
+++ b/src/font.h
@@ -762,6 +762,7 @@ extern Lisp_Object font_load_for_lface P_ ((FRAME_PTR f, Lisp_Object *lface,
 extern void font_prepare_for_face P_ ((FRAME_PTR f, struct face *face));
 extern void font_done_for_face P_ ((FRAME_PTR f, struct face *face));
 
+extern Lisp_Object font_open_by_spec P_ ((FRAME_PTR f, Lisp_Object spec));
 extern Lisp_Object font_open_by_name P_ ((FRAME_PTR f, char *name));
 extern void font_close_object (FRAME_PTR f, Lisp_Object font_object);