diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 19092201f6f..62fed7d5fc1 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,10 @@
+2014-05-07  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/61023
+	* include/bits/stl_tree.h (_Rb_tree::_M_move_assign): Copy the
+	comparison function.
+	* testsuite/23_containers/set/cons/61023.cc: New.
+
 2014-05-06  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* include/Makefile.in: Regenerate.
diff --git a/libstdc++-v3/include/bits/stl_tree.h b/libstdc++-v3/include/bits/stl_tree.h
index 288c9fa4f1e..ce43ab84686 100644
--- a/libstdc++-v3/include/bits/stl_tree.h
+++ b/libstdc++-v3/include/bits/stl_tree.h
@@ -1073,6 +1073,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
     _M_move_assign(_Rb_tree& __x)
     {
+      _M_impl._M_key_compare = __x._M_impl._M_key_compare;
       if (_Alloc_traits::_S_propagate_on_move_assign()
 	  || _Alloc_traits::_S_always_equal()
 	  || _M_get_Node_allocator() == __x._M_get_Node_allocator())
diff --git a/libstdc++-v3/testsuite/23_containers/set/cons/61023.cc b/libstdc++-v3/testsuite/23_containers/set/cons/61023.cc
new file mode 100644
index 00000000000..087b9cc188a
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/set/cons/61023.cc
@@ -0,0 +1,56 @@
+// { dg-options "-std=gnu++11" }
+
+// Copyright (C) 2014 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <set>
+#include <stdexcept>
+
+struct Comparator
+{
+  Comparator() : valid(false) { }
+  explicit Comparator(bool) : valid(true) { }
+
+  bool operator()(int i, int j) const
+  {
+    if (!valid)
+      throw std::logic_error("Comparator is invalid");
+    return i < j;
+  }
+
+private:
+  bool valid;
+};
+
+int main()
+{
+  using test_type = std::set<int, Comparator>;
+
+  Comparator cmp{true};
+
+  test_type good{cmp};
+
+  test_type s1;
+  s1 = good;             // copy-assign
+  s1.insert(1);
+  s1.insert(2);
+
+  test_type s2;
+  s2 = std::move(good);  // move-assign
+  s2.insert(1);
+  s2.insert(2);
+}