diff --git a/include/deque b/include/deque
index 2ac7bf38..6b419c5b 100644
--- a/include/deque
+++ b/include/deque
@@ -168,6 +168,7 @@ template <class T, class Allocator>
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _Tp, class _Allocator> class __deque_base;
+template <class _Tp, class _Allocator = allocator<_Tp> > class _LIBCPP_TYPE_VIS_ONLY deque;
 
 template <class _ValueType, class _Pointer, class _Reference, class _MapPointer,
           class _DiffType, _DiffType _BlockSize>
@@ -1178,7 +1179,7 @@ __deque_base<_Tp, _Allocator>::clear() _NOEXCEPT
     }
 }
 
-template <class _Tp, class _Allocator = allocator<_Tp> >
+template <class _Tp, class _Allocator /*= allocator<_Tp>*/>
 class _LIBCPP_TYPE_VIS_ONLY deque
     : private __deque_base<_Tp, _Allocator>
 {
diff --git a/include/forward_list b/include/forward_list
index 651452f3..a442a9b6 100644
--- a/include/forward_list
+++ b/include/forward_list
@@ -218,7 +218,7 @@ struct __forward_list_node
     value_type __value_;
 };
 
-template<class _Tp, class _Alloc> class _LIBCPP_TYPE_VIS_ONLY forward_list;
+template <class _Tp, class _Alloc = allocator<_Tp> > class _LIBCPP_TYPE_VIS_ONLY forward_list;
 template<class _NodeConstPtr> class _LIBCPP_TYPE_VIS_ONLY __forward_list_const_iterator;
 
 template <class _NodePtr>
@@ -547,7 +547,7 @@ __forward_list_base<_Tp, _Alloc>::clear() _NOEXCEPT
     __before_begin()->__next_ = nullptr;
 }
 
-template <class _Tp, class _Alloc = allocator<_Tp> >
+template <class _Tp, class _Alloc /*= allocator<_Tp>*/>
 class _LIBCPP_TYPE_VIS_ONLY forward_list
     : private __forward_list_base<_Tp, _Alloc>
 {
diff --git a/include/list b/include/list
index 13f8a53b..13e1199d 100644
--- a/include/list
+++ b/include/list
@@ -226,7 +226,7 @@ struct __list_node
     _Tp __value_;
 };
 
-template <class _Tp, class _Alloc> class _LIBCPP_TYPE_VIS_ONLY list;
+template <class _Tp, class _Alloc = allocator<_Tp> > class _LIBCPP_TYPE_VIS_ONLY list;
 template <class _Tp, class _Alloc> class __list_imp;
 template <class _Tp, class _VoidPtr> class _LIBCPP_TYPE_VIS_ONLY __list_const_iterator;
 
@@ -799,7 +799,7 @@ __list_imp<_Tp, _Alloc>::swap(__list_imp& __c)
 #endif
 }
 
-template <class _Tp, class _Alloc = allocator<_Tp> >
+template <class _Tp, class _Alloc /*= allocator<_Tp>*/>
 class _LIBCPP_TYPE_VIS_ONLY list
     : private __list_imp<_Tp, _Alloc>
 {