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-rw-r--r--newlib/libc/include/sys/unistd.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/newlib/libc/include/sys/unistd.h b/newlib/libc/include/sys/unistd.h
index fa7361a25..8a296fe3b 100644
--- a/newlib/libc/include/sys/unistd.h
+++ b/newlib/libc/include/sys/unistd.h
@@ -166,7 +166,7 @@ long _EXFUN(sysconf, (int __name ));
pid_t _EXFUN(tcgetpgrp, (int __fildes ));
int _EXFUN(tcsetpgrp, (int __fildes, pid_t __pgrp_id ));
char _EXFUN(*ttyname, (int __fildes ));
-#if defined(__CYGWIN__)
+#if defined(__CYGWIN__) || defined(__rtems__)
int _EXFUN(ttyname_r, (int, char *, size_t));
#endif
int _EXFUN(unlink, (const char *__path ));