diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 31224f32367..68930acc1d8 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,11 @@
+2009-12-11  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR libstdc++/22634, DR 539 [Ready]
+	* include/bits/stl_numeric.h (adjacent_difference): Use std::move
+	at the end of the loop body, per the Ready resolution.
+	* include/std/numeric: Do not include unnecessarily <cstddef>.
+	* doc/xml/manual/intro.xml: Add an entry for DR 539.
+
 2009-12-11  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* doc/html/ext/lwg-active.html: Update to Revision R68.
diff --git a/libstdc++-v3/doc/xml/manual/intro.xml b/libstdc++-v3/doc/xml/manual/intro.xml
index da06cd90525..1c5e7f64e55 100644
--- a/libstdc++-v3/doc/xml/manual/intro.xml
+++ b/libstdc++-v3/doc/xml/manual/intro.xml
@@ -699,6 +699,14 @@ requirements of the license of GCC.
         input_iterator' value_type.
     </para></listitem></varlistentry>
 
+    <varlistentry><term><ulink url="../ext/lwg-active.html#539">539</ulink>:
+        <emphasis>partial_sum and adjacent_difference should mention
+            requirements</emphasis>
+    </term>
+    <listitem><para>We were almost doing the right thing, just use std::move
+        in adjacent_difference.
+    </para></listitem></varlistentry>
+
     <varlistentry><term><ulink url="../ext/lwg-defects.html#541">541</ulink>:
         <emphasis>shared_ptr template assignment and void</emphasis>
     </term>
diff --git a/libstdc++-v3/include/bits/stl_numeric.h b/libstdc++-v3/include/bits/stl_numeric.h
index 5edf2bc5d9f..1adddf6babc 100644
--- a/libstdc++-v3/include/bits/stl_numeric.h
+++ b/libstdc++-v3/include/bits/stl_numeric.h
@@ -59,6 +59,7 @@
 
 #include <bits/concept_check.h>
 #include <debug/debug.h>
+#include <bits/move.h> // For _GLIBCXX_MOVE
 
 #ifdef __GXX_EXPERIMENTAL_CXX0X__
 
@@ -302,6 +303,9 @@ _GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_P)
    *  @param  last  End of input range.
    *  @param  result  Output to write sums to.
    *  @return  Iterator pointing just beyond the values written to result.
+   *
+   *  _GLIBCXX_RESOLVE_LIB_DEFECTS
+   *  DR 539. partial_sum and adjacent_difference should mention requirements
    */
   template<typename _InputIterator, typename _OutputIterator>
     _OutputIterator
@@ -324,7 +328,7 @@ _GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_P)
 	{
 	  _ValueType __tmp = *__first;
 	  *++__result = __tmp - __value;
-	  __value = __tmp;
+	  __value = _GLIBCXX_MOVE(__tmp);
 	}
       return ++__result;
     }
@@ -340,6 +344,9 @@ _GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_P)
    *  @param  last  End of input range.
    *  @param  result  Output to write sums to.
    *  @return  Iterator pointing just beyond the values written to result.
+   *
+   *  _GLIBCXX_RESOLVE_LIB_DEFECTS
+   *  DR 539. partial_sum and adjacent_difference should mention requirements
    */
   template<typename _InputIterator, typename _OutputIterator,
 	   typename _BinaryOperation>
@@ -363,7 +370,7 @@ _GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_P)
 	{
 	  _ValueType __tmp = *__first;
 	  *++__result = __binary_op(__tmp, __value);
-	  __value = __tmp;
+	  __value = _GLIBCXX_MOVE(__tmp);
 	}
       return ++__result;
     }
diff --git a/libstdc++-v3/include/std/numeric b/libstdc++-v3/include/std/numeric
index 43d76d98037..1acedf4e634 100644
--- a/libstdc++-v3/include/std/numeric
+++ b/libstdc++-v3/include/std/numeric
@@ -58,7 +58,6 @@
 #pragma GCC system_header
 
 #include <bits/c++config.h>
-#include <cstddef>
 #include <bits/stl_iterator_base_types.h>
 #include <bits/stl_numeric.h>