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-rw-r--r--posix/unistd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index 424cedd2ec..ab40f24f83 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -503,6 +503,7 @@ extern char *ttyname __P ((int __fd));
 #ifdef __USE_REENTRANT
 /* Store at most BUFLEN characters of the pathname of the terminal FD is
    open on in BUF.  Return 0 on success, -1 otherwise.  */
+extern int __ttyname_r __P ((int __fd, char *__buf, int __buflen));
 extern int ttyname_r __P ((int __fd, char *__buf, int __buflen));
 #endif