diff --git a/libcxx/include/numeric b/libcxx/include/numeric
--- a/libcxx/include/numeric
+++ b/libcxx/include/numeric
@@ -308,13 +308,12 @@
 {
     if (__first != __last)
     {
-        _Tp __saved = __init;
         do
         {
-            __init = __b(__init, *__first);
-            *__result = __saved;
-            __saved = __init;
+            _Tp __tmp = __b(__init, *__first);
+            *__result = __init;
             ++__result;
+            __init = _VSTD::move(__tmp);
         } while (++__first != __last);
     }
     return __result;