diff --git a/Include/pyport.h b/Include/pyport.h
index 17dad41..ca20b22 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -673,10 +673,8 @@
 /* BSDI does not supply a prototype for the 'openpty' and 'forkpty'
    functions, even though they are included in libutil. */
 #include <termios.h>
-extern int openpty(int *, int *, char *,
-                   const struct termios *, const struct winsize *);
-extern pid_t forkpty(int *, char *,
-                     const struct termios *, const struct winsize *);
+extern int openpty(int *, int *, char *, struct termios *, struct winsize *);
+extern pid_t forkpty(int *, char *, struct termios *, struct winsize *);
 #endif /* !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H) */
 #endif /* defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY) */