diff --git a/include/boost/array.hpp b/include/boost/array.hpp
index 02bd76d..21e6632 100644
--- a/include/boost/array.hpp
+++ b/include/boost/array.hpp
@@ -117,14 +117,14 @@ namespace boost {
             return BOOST_ASSERT_MSG( i < N, "out of range" ), elems[i];
         }
 
-        /*BOOST_CONSTEXPR*/ const_reference operator[](size_type i) const
+        BOOST_CONSTEXPR const_reference operator[](size_type i) const
         {
             return BOOST_ASSERT_MSG( i < N, "out of range" ), elems[i];
         }
 
         // at() with range check
         reference                           at(size_type i)       { return rangecheck(i), elems[i]; }
-        /*BOOST_CONSTEXPR*/ const_reference at(size_type i) const { return rangecheck(i), elems[i]; }
+        BOOST_CONSTEXPR const_reference at(size_type i) const { return rangecheck(i), elems[i]; }
 
         // front() and back()
         reference front()
@@ -246,14 +246,14 @@ namespace boost {
             return failed_rangecheck();
         }
 
-        /*BOOST_CONSTEXPR*/ const_reference operator[](size_type /*i*/) const
+        BOOST_CONSTEXPR const_reference operator[](size_type /*i*/) const
         {
             return failed_rangecheck();
         }
 
         // at() with range check
         reference at(size_type /*i*/)               {   return failed_rangecheck(); }
-        /*BOOST_CONSTEXPR*/ const_reference at(size_type /*i*/) const   { return failed_rangecheck(); }
+        BOOST_CONSTEXPR const_reference at(size_type /*i*/) const   { return failed_rangecheck(); }
 
         // front() and back()
         reference front()
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index ef83df7..19f857e 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -18,7 +18,7 @@ run array5.cpp ;
 run array6.cpp ;
 run array7.cpp ;
 
-# run array_constexpr.cpp ;
+compile array_constexpr.cpp ;
 
 compile-fail array_getfail1.cpp ;
 compile-fail array_getfail2.cpp ;
diff --git a/test/array_constexpr.cpp b/test/array_constexpr.cpp
index 48995c9..a6c0dc6 100644
--- a/test/array_constexpr.cpp
+++ b/test/array_constexpr.cpp
@@ -5,27 +5,15 @@
  * http://www.boost.org/LICENSE_1_0.txt)
  */ 
 
-#include <string>
-#include <iostream>
 #include <boost/array.hpp>
-#include <algorithm>
-#ifndef BOOST_NO_CXX11_HDR_ARRAY
-#include <array>
-#endif
+#include <boost/config.hpp>
 
 #ifndef BOOST_NO_CXX11_CONSTEXPR
+
 constexpr boost::array<int, 10> arr  {{ 0,1,2,3,4,5,6,7,8,9 }};
-constexpr std::array<int, 10> arr_std {{ 0,1,2,3,4,5,6,7,8,9 }};
-
-template <typename T>
-void sink ( T t ) {}
-
-template <typename T, size_t N>
-void sink ( boost::array<T,N> &arr ) {}
 
 int main()
 {
-//    constexpr int two = arr_std.at (2);
     constexpr int three = arr.at (3);
     int whatever [ arr.at(4) ];
     (void)three;
@@ -33,7 +21,9 @@ int main()
 }
 
 #else   // no constexpr means no constexpr tests!
+
 int main()
 {
 }
+
 #endif