diff --git a/time/time.h b/time/time.h
index 4db274bd0c..368f4dc588 100644
--- a/time/time.h
+++ b/time/time.h
@@ -99,7 +99,8 @@ extern time_t __REDIRECT_NTH (mktime, (struct tm *__tp), __mktime64);
    of characters written, or 0 if it would exceed MAXSIZE.  */
 extern size_t strftime (char *__restrict __s, size_t __maxsize,
 			const char *__restrict __format,
-			const struct tm *__restrict __tp) __THROW;
+			const struct tm *__restrict __tp)
+			__THROW __nonnull((1, 3, 4));
 
 #ifdef __USE_XOPEN
 /* Parse S according to FORMAT and store binary time information in TP.