diff --git a/include/queue b/include/queue
index bdfd7060..6f49c87a 100644
--- a/include/queue
+++ b/include/queue
@@ -177,7 +177,7 @@ template <class T, class Container, class Compare>
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-template <class _Tp, class _Container> class _LIBCPP_TYPE_VIS_ONLY queue;
+template <class _Tp, class _Container = deque<_Tp> > class _LIBCPP_TYPE_VIS_ONLY queue;
 
 template <class _Tp, class _Container>
 _LIBCPP_INLINE_VISIBILITY
@@ -189,7 +189,7 @@ _LIBCPP_INLINE_VISIBILITY
 bool
 operator< (const queue<_Tp, _Container>& __x,const queue<_Tp, _Container>& __y);
 
-template <class _Tp, class _Container = deque<_Tp> >
+template <class _Tp, class _Container /*= deque<_Tp>*/>
 class _LIBCPP_TYPE_VIS_ONLY queue
 {
 public:
diff --git a/include/stack b/include/stack
index 30909c1e..2992b091 100644
--- a/include/stack
+++ b/include/stack
@@ -91,7 +91,7 @@ template <class T, class Container>
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-template <class _Tp, class _Container> class _LIBCPP_TYPE_VIS_ONLY stack;
+template <class _Tp, class _Container = deque<_Tp> > class _LIBCPP_TYPE_VIS_ONLY stack;
 
 template <class _Tp, class _Container>
 _LIBCPP_INLINE_VISIBILITY
@@ -103,7 +103,7 @@ _LIBCPP_INLINE_VISIBILITY
 bool
 operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
 
-template <class _Tp, class _Container = deque<_Tp> >
+template <class _Tp, class _Container /*= deque<_Tp>*/>
 class _LIBCPP_TYPE_VIS_ONLY stack
 {
 public: