diff --git a/doc/html/mp11.html b/doc/html/mp11.html
index 2095b7c..bb35201 100644
--- a/doc/html/mp11.html
+++ b/doc/html/mp11.html
@@ -1853,7 +1853,7 @@ int main()
 <h4 id="mp_identity_t_t">mp_identity_t&lt;T&gt;</h4>
 <div class="literalblock">
 <div class="content">
-<pre>template&lt;class T&gt; using mp_identity_t = T;</pre>
+<pre>template&lt;class T&gt; using mp_identity_t = typename mp_identity&lt;T&gt;::type;</pre>
 </div>
 </div>
 </div>
@@ -3377,7 +3377,7 @@ expression <code>f(std::get&lt;J&gt;(std::forward&lt;Tp&gt;(tp)))</code> for <co
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2017-06-10 01:59:58 GTBDT
+Last updated 2017-06-10 03:46:37 GTBDT
 </div>
 </div>
 </body>
diff --git a/doc/mp11/utility.adoc b/doc/mp11/utility.adoc
index 2ddf452..2488986 100644
--- a/doc/mp11/utility.adoc
+++ b/doc/mp11/utility.adoc
@@ -51,7 +51,7 @@ int main()
 
 ## mp_identity_t<T>
 
-    template<class T> using mp_identity_t = T;
+    template<class T> using mp_identity_t = typename mp_identity<T>::type;
 
 ## mp_inherit<T...>
 
diff --git a/include/boost/mp11/utility.hpp b/include/boost/mp11/utility.hpp
index 35af770..bf58361 100644
--- a/include/boost/mp11/utility.hpp
+++ b/include/boost/mp11/utility.hpp
@@ -24,7 +24,7 @@ template<class T> struct mp_identity
 };
 
 // mp_identity_t
-template<class T> using mp_identity_t = T;
+template<class T> using mp_identity_t = typename mp_identity<T>::type;
 
 // mp_inherit
 template<class... T> struct mp_inherit: T... {};
diff --git a/include/boost/mp11_single.hpp b/include/boost/mp11_single.hpp
index 7e658ab..5898d3f 100644
--- a/include/boost/mp11_single.hpp
+++ b/include/boost/mp11_single.hpp
@@ -117,7 +117,7 @@ template<class T> struct mp_identity
 };
 
 // mp_identity_t
-template<class T> using mp_identity_t = T;
+template<class T> using mp_identity_t = typename mp_identity<T>::type;
 
 // mp_inherit
 template<class... T> struct mp_inherit: T... {};