diff --git a/src/proto/misc2.pro b/src/proto/misc2.pro
index d8d3cc3..16c5918 100644
--- a/src/proto/misc2.pro
+++ b/src/proto/misc2.pro
@@ -116,4 +116,5 @@
 char_u *read_string __ARGS((FILE *fd, int cnt));
 int put_bytes __ARGS((FILE *fd, long_u nr, int len));
 void put_time __ARGS((FILE *fd, time_t the_time));
+int has_non_ascii __ARGS((char_u *s));
 /* vim: set ft=c : */