1 files changed, 4 insertions, 0 deletions
diff --git a/regex.h b/regex.h
index 1bca032024..1d25ea62e1 100644
--- a/regex.h
+++ b/regex.h
@@ -172,7 +172,11 @@ extern long re_syntax_options;
 extern const unsigned char *mbctab;
 extern int current_mbctype;
 
+#ifdef __STDC__
 void mbcinit (int);
+#else
+void mbcinit ();
+#endif
 
 #undef ismbchar
 #define ismbchar(c) mbctab[(unsigned char)(c)]