1 files changed, 2 insertions, 0 deletions
diff --git a/include/time.h b/include/time.h
index cacb7f2f26e4..52c95918f116 100644
--- a/include/time.h
+++ b/include/time.h
@@ -146,7 +146,9 @@ __BEGIN_DECLS
 char *asctime(const struct tm *);
 clock_t clock(void);
 char *ctime(const time_t *);
+#ifndef _STANDALONE
 double difftime(time_t, time_t);
+#endif
 /* XXX missing: getdate() */
 struct tm *gmtime(const time_t *);
 struct tm *localtime(const time_t *);