1 files changed, 1 insertions, 0 deletions

diff --git a/src/coding.h b/src/coding.h
index 66d125b07e6..bc4ef52e1ed 100644
--- a/src/coding.h
+++ b/src/coding.h
@@ -665,6 +665,7 @@ struct coding_system
 /* Extern declarations.  */
 extern Lisp_Object code_conversion_save (bool, bool);
 extern bool encode_coding_utf_8 (struct coding_system *);
+extern bool utf8_string_p (Lisp_Object);
 extern void setup_coding_system (Lisp_Object, struct coding_system *);
 extern Lisp_Object coding_charset_list (struct coding_system *);
 extern Lisp_Object coding_system_charset_list (Lisp_Object);