diff --git a/libcxx/include/complex b/libcxx/include/complex
index 41a47cfba47c..c7c1cdedf4d7 100644
--- a/libcxx/include/complex
+++ b/libcxx/include/complex
@@ -203,7 +203,7 @@ template<class T>    complex<T>           proj(const complex<T>&);
 template<Integral T> complex<double>      proj(T);
                      complex<float>       proj(float);
 
-template<class T> complex<T> polar(const T&, const T& = 0);
+template<class T> complex<T> polar(const T&, const T& = T());
 
 // 26.3.8 transcendentals:
 template<class T> complex<T> acos(const complex<T>&);
@@ -991,7 +991,7 @@ proj(_Tp __re)
 
 template<class _Tp>
 complex<_Tp>
-polar(const _Tp& __rho, const _Tp& __theta = _Tp(0))
+polar(const _Tp& __rho, const _Tp& __theta = _Tp())
 {
     if (__libcpp_isnan_or_builtin(__rho) || signbit(__rho))
         return complex<_Tp>(_Tp(NAN), _Tp(NAN));
diff --git a/libcxx/test/std/numerics/complex.number/complex.value.ops/polar.pass.cpp b/libcxx/test/std/numerics/complex.number/complex.value.ops/polar.pass.cpp
index 5e6cb0d523c2..69463ded2b40 100644
--- a/libcxx/test/std/numerics/complex.number/complex.value.ops/polar.pass.cpp
+++ b/libcxx/test/std/numerics/complex.number/complex.value.ops/polar.pass.cpp
@@ -11,7 +11,7 @@
 
 // template<class T>
 //   complex<T>
-//   polar(const T& rho, const T& theta = 0);
+//   polar(const T& rho, const T& theta = T());  // changed from '0' by LWG#2870
 
 #include <complex>
 #include <cassert>
diff --git a/libcxx/www/cxx2a_status.html b/libcxx/www/cxx2a_status.html
index 68206cb7f796..684ed7da2e7b 100644
--- a/libcxx/www/cxx2a_status.html
+++ b/libcxx/www/cxx2a_status.html
@@ -106,7 +106,7 @@
 
  	<tr><td></td><td></td><td></td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG2779">2779</a></td><td>[networking.ts] Relax requirements on buffer sequence iterators</td><td>Albuquerque</td><td></td></tr>
-	<tr><td><a href="https://wg21.link/LWG2870">2870</a></td><td>Default value of parameter theta of polar should be dependent</td><td>Albuquerque</td><td></td></tr>
+	<tr><td><a href="https://wg21.link/LWG2870">2870</a></td><td>Default value of parameter theta of polar should be dependent</td><td>Albuquerque</td><td>Complete</td></tr>
 	<tr><td><a href="https://wg21.link/LWG2935">2935</a></td><td>What should create_directories do when p already exists but is not a directory?</td><td>Albuquerque</td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG2941">2941</a></td><td>[thread.req.timing] wording should apply to both member and namespace-level functions</td><td>Albuquerque</td><td><i>Nothing to do</i></td></tr>
 	<tr><td><a href="https://wg21.link/LWG2944">2944</a></td><td>LWG 2905 accidentally removed requirement that construction of the deleter doesn't throw an exception</td><td>Albuquerque</td><td><i>Nothing to do</i></td></tr>
@@ -135,7 +135,7 @@
 <!-- 	<tr><td></td><td></td><td></td><td></td></tr> -->
   </table>
 
-  <p>Last Updated: 24-Jan-2018</p>
+  <p>Last Updated: 31-Jan-2018</p>
 </div>
 </body>
 </html>