diff --git a/libstdc++-v3/include/std/bitset b/libstdc++-v3/include/std/bitset
index c169269698a..3243c649731 100644
--- a/libstdc++-v3/include/std/bitset
+++ b/libstdc++-v3/include/std/bitset
@@ -320,17 +320,18 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
     _GLIBCXX14_CONSTEXPR unsigned long long
     _Base_bitset<_Nw>::_M_do_to_ullong() const
     {
-      const bool __dw = sizeof(unsigned long long) > sizeof(unsigned long);
-      for (size_t __i = 1 + __dw; __i < _Nw; ++__i)
+#if __SIZEOF_LONG_LONG__ == __SIZEOF_LONG__
+      return _M_do_to_ulong();
+#else
+      for (size_t __i = 2; __i < _Nw; ++__i)
 	if (_M_w[__i])
 	  __throw_overflow_error(__N("_Base_bitset::_M_do_to_ullong"));
 
-      if (__dw)
-	return _M_w[0] + (static_cast<unsigned long long>(_M_w[1])
+      return _M_w[0] + (static_cast<unsigned long long>(_M_w[1])
 			  << _GLIBCXX_BITSET_BITS_PER_WORD);
-      return _M_w[0];
-    }
 #endif
+    }
+#endif // C++11
 
   template<size_t _Nw>
     _GLIBCXX14_CONSTEXPR size_t