diff --git a/src/proto/regexp.pro b/src/proto/regexp.pro
index df2fde4..27597b2 100644
--- a/src/proto/regexp.pro
+++ b/src/proto/regexp.pro
@@ -1,17 +1,17 @@
 /* regexp.c */
-void free_regexp_stuff __ARGS((void));
-int re_multiline __ARGS((regprog_T *prog));
-int re_lookbehind __ARGS((regprog_T *prog));
-char_u *skip_regexp __ARGS((char_u *startp, int dirc, int magic, char_u **newp));
-regprog_T *vim_regcomp __ARGS((char_u *expr, int re_flags));
-int vim_regcomp_had_eol __ARGS((void));
-int vim_regexec __ARGS((regmatch_T *rmp, char_u *line, colnr_T col));
-int vim_regexec_nl __ARGS((regmatch_T *rmp, char_u *line, colnr_T col));
-long vim_regexec_multi __ARGS((regmmatch_T *rmp, win_T *win, buf_T *buf, linenr_T lnum, colnr_T col));
-reg_extmatch_T *ref_extmatch __ARGS((reg_extmatch_T *em));
-void unref_extmatch __ARGS((reg_extmatch_T *em));
-char_u *regtilde __ARGS((char_u *source, int magic));
-int vim_regsub __ARGS((regmatch_T *rmp, char_u *source, char_u *dest, int copy, int magic, int backslash));
-int vim_regsub_multi __ARGS((regmmatch_T *rmp, linenr_T lnum, char_u *source, char_u *dest, int copy, int magic, int backslash));
-char_u *reg_submatch __ARGS((int no));
+extern void free_regexp_stuff __ARGS((void));
+extern int re_multiline __ARGS((regprog_T *prog));
+extern int re_lookbehind __ARGS((regprog_T *prog));
+extern char_u *skip_regexp __ARGS((char_u *startp, int dirc, int magic, char_u **newp));
+extern regprog_T *vim_regcomp __ARGS((char_u *expr, int re_flags));
+extern int vim_regcomp_had_eol __ARGS((void));
+extern int vim_regexec __ARGS((regmatch_T *rmp, char_u *line, colnr_T col));
+extern int vim_regexec_nl __ARGS((regmatch_T *rmp, char_u *line, colnr_T col));
+extern long vim_regexec_multi __ARGS((regmmatch_T *rmp, win_T *win, buf_T *buf, linenr_T lnum, colnr_T col));
+extern reg_extmatch_T *ref_extmatch __ARGS((reg_extmatch_T *em));
+extern void unref_extmatch __ARGS((reg_extmatch_T *em));
+extern char_u *regtilde __ARGS((char_u *source, int magic));
+extern int vim_regsub __ARGS((regmatch_T *rmp, char_u *source, char_u *dest, int copy, int magic, int backslash));
+extern int vim_regsub_multi __ARGS((regmmatch_T *rmp, linenr_T lnum, char_u *source, char_u *dest, int copy, int magic, int backslash));
+extern char_u *reg_submatch __ARGS((int no));
 /* vim: set ft=c : */