diff --git a/include/vector b/include/vector
index e4fc024d..258a950d 100644
--- a/include/vector
+++ b/include/vector
@@ -38,6 +38,7 @@ public:
         noexcept(is_nothrow_default_constructible<allocator_type>::value);
     explicit vector(const allocator_type&);
     explicit vector(size_type n);
+    explicit vector(size_type n, const allocator_type&); // C++14
     vector(size_type n, const value_type& value, const allocator_type& = allocator_type());
     template <class InputIterator>
         vector(InputIterator first, InputIterator last, const allocator_type& = allocator_type());
@@ -161,7 +162,8 @@ public:
     vector()
         noexcept(is_nothrow_default_constructible<allocator_type>::value);
     explicit vector(const allocator_type&);
-    explicit vector(size_type n, const value_type& value = value_type(), const allocator_type& = allocator_type());
+    explicit vector(size_type n, const allocator_type& a = allocator_type()); // C++14
+    vector(size_type n, const value_type& value, const allocator_type& = allocator_type());
     template <class InputIterator>
         vector(InputIterator first, InputIterator last, const allocator_type& = allocator_type());
     vector(const vector& x);
@@ -516,6 +518,9 @@ public:
 #endif
     }
     explicit vector(size_type __n);
+#if _LIBCPP_STD_VER > 11
+    explicit vector(size_type __n, const allocator_type& __a);
+#endif
     vector(size_type __n, const_reference __x);
     vector(size_type __n, const_reference __x, const allocator_type& __a);
     template <class _InputIterator>
@@ -1022,6 +1027,22 @@ vector<_Tp, _Allocator>::vector(size_type __n)
     }
 }
 
+#if _LIBCPP_STD_VER > 11
+template <class _Tp, class _Allocator>
+vector<_Tp, _Allocator>::vector(size_type __n, const allocator_type& __a)
+    : __base(__a)
+{
+#if _LIBCPP_DEBUG_LEVEL >= 2
+    __get_db()->__insert_c(this);
+#endif
+    if (__n > 0)
+    {
+        allocate(__n);
+        __construct_at_end(__n);
+    }
+}
+#endif
+
 template <class _Tp, class _Allocator>
 vector<_Tp, _Allocator>::vector(size_type __n, const_reference __x)
 {
@@ -2079,6 +2100,9 @@ public:
     _LIBCPP_INLINE_VISIBILITY explicit vector(const allocator_type& __a);
     ~vector();
     explicit vector(size_type __n);
+#if _LIBCPP_STD_VER > 11
+    explicit vector(size_type __n, const allocator_type& __a);
+#endif
     vector(size_type __n, const value_type& __v);
     vector(size_type __n, const value_type& __v, const allocator_type& __a);
     template <class _InputIterator>
@@ -2489,6 +2513,21 @@ vector<bool, _Allocator>::vector(size_type __n)
     }
 }
 
+#if _LIBCPP_STD_VER > 11
+template <class _Allocator>
+vector<bool, _Allocator>::vector(size_type __n, const allocator_type& __a)
+    : __begin_(nullptr),
+      __size_(0),
+      __cap_alloc_(0, static_cast<__storage_allocator>(__a))
+{
+    if (__n > 0)
+    {
+        allocate(__n);
+        __construct_at_end(__n, false);
+    }
+}
+#endif
+
 template <class _Allocator>
 vector<bool, _Allocator>::vector(size_type __n, const value_type& __x)
     : __begin_(nullptr),
diff --git a/test/containers/sequences/vector.bool/construct_size.pass.cpp b/test/containers/sequences/vector.bool/construct_size.pass.cpp
index 0bbd3627..aa4ca0e2 100644
--- a/test/containers/sequences/vector.bool/construct_size.pass.cpp
+++ b/test/containers/sequences/vector.bool/construct_size.pass.cpp
@@ -16,10 +16,27 @@
 #include <cassert>
 
 #include "../../min_allocator.h"
+#include "../../test_allocator.h"
 
 template <class C>
 void
-test(typename C::size_type n)
+test2(typename C::size_type n, typename C::allocator_type const& a = typename C::allocator_type ())
+{
+#if _LIBCPP_STD_VER > 11
+    C c(n, a);
+    assert(c.__invariants());
+    assert(c.size() == n);
+    assert(c.get_allocator() == a);
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    for (typename C::const_iterator i = c.cbegin(), e = c.cend(); i != e; ++i)
+        assert(*i == typename C::value_type());
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+#endif
+}
+
+template <class C>
+void
+test1(typename C::size_type n)
 {
     C c(n);
     assert(c.__invariants());
@@ -29,10 +46,19 @@ test(typename C::size_type n)
         assert(*i == typename C::value_type());
 }
 
+template <class C>
+void
+test(typename C::size_type n)
+{
+    test1<C> ( n );
+    test2<C> ( n );
+}
+
 int main()
 {
     test<std::vector<bool> >(50);
 #if __cplusplus >= 201103L
     test<std::vector<bool, min_allocator<bool>> >(50);
+    test2<std::vector<bool, test_allocator<bool>> >( 100, test_allocator<bool>(23));
 #endif
 }
diff --git a/test/containers/sequences/vector/vector.cons/construct_size.pass.cpp b/test/containers/sequences/vector/vector.cons/construct_size.pass.cpp
index c49b6686..19d27602 100644
--- a/test/containers/sequences/vector/vector.cons/construct_size.pass.cpp
+++ b/test/containers/sequences/vector/vector.cons/construct_size.pass.cpp
@@ -16,10 +16,27 @@
 
 #include "../../../DefaultOnly.h"
 #include "../../../min_allocator.h"
+#include "../../../test_allocator.h"
 
 template <class C>
 void
-test(typename C::size_type n)
+test2(typename C::size_type n, typename C::allocator_type const& a = typename C::allocator_type ())
+{
+#if _LIBCPP_STD_VER > 11
+    C c(n, a);
+    assert(c.__invariants());
+    assert(c.size() == n);
+    assert(c.get_allocator() == a);
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    for (typename C::const_iterator i = c.cbegin(), e = c.cend(); i != e; ++i)
+        assert(*i == typename C::value_type());
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+#endif
+}
+
+template <class C>
+void
+test1(typename C::size_type n)
 {
     C c(n);
     assert(c.__invariants());
@@ -31,6 +48,14 @@ test(typename C::size_type n)
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 }
 
+template <class C>
+void
+test(typename C::size_type n)
+{
+    test1<C> ( n );
+    test2<C> ( n );
+}
+
 int main()
 {
     test<std::vector<int> >(50);
@@ -39,6 +64,7 @@ int main()
 #if __cplusplus >= 201103L
     test<std::vector<int, min_allocator<int>> >(50);
     test<std::vector<DefaultOnly, min_allocator<DefaultOnly>> >(500);
+    test2<std::vector<DefaultOnly, test_allocator<DefaultOnly>> >( 100, test_allocator<DefaultOnly>(23));
     assert(DefaultOnly::count == 0);
 #endif
 }