diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index 70f8d89..ccf8bff 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -637,7 +637,7 @@
 extern unsigned int cpp_token_len (const cpp_token *);
 extern unsigned char *cpp_token_as_text (cpp_reader *, const cpp_token *);
 extern unsigned char *cpp_spell_token (cpp_reader *, const cpp_token *,
-				       unsigned char *);
+				       unsigned char *, bool);
 extern void cpp_register_pragma (cpp_reader *, const char *, const char *,
 				 void (*) (cpp_reader *), bool);
 extern void cpp_handle_deferred_pragma (cpp_reader *, const cpp_string *);