diff --git a/libcxx/include/memory b/libcxx/include/memory
index 2a25f0ecb507..638999ea6e7f 100644
--- a/libcxx/include/memory
+++ b/libcxx/include/memory
@@ -1542,26 +1542,26 @@ struct _LIBCPP_TEMPLATE_VIS allocator_traits
 #else  // _LIBCPP_HAS_NO_VARIADICS
     template <class _Tp>
         _LIBCPP_INLINE_VISIBILITY
-        static void construct(allocator_type& __a, _Tp* __p)
+        static void construct(allocator_type&, _Tp* __p)
             {
                 ::new ((void*)__p) _Tp();
             }
     template <class _Tp, class _A0>
         _LIBCPP_INLINE_VISIBILITY
-        static void construct(allocator_type& __a, _Tp* __p, const _A0& __a0)
+        static void construct(allocator_type&, _Tp* __p, const _A0& __a0)
             {
                 ::new ((void*)__p) _Tp(__a0);
             }
     template <class _Tp, class _A0, class _A1>
         _LIBCPP_INLINE_VISIBILITY
-        static void construct(allocator_type& __a, _Tp* __p, const _A0& __a0,
+        static void construct(allocator_type&, _Tp* __p, const _A0& __a0,
                               const _A1& __a1)
             {
                 ::new ((void*)__p) _Tp(__a0, __a1);
             }
     template <class _Tp, class _A0, class _A1, class _A2>
         _LIBCPP_INLINE_VISIBILITY
-        static void construct(allocator_type& __a, _Tp* __p, const _A0& __a0,
+        static void construct(allocator_type&, _Tp* __p, const _A0& __a0,
                               const _A1& __a1, const _A2& __a2)
             {
                 ::new ((void*)__p) _Tp(__a0, __a1, __a2);