diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 0aeb6c06223..febf2a8694c 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,10 @@
+2012-06-18  Jörg Sonnenberger <joerg@britannica.bec.de>
+	    Jonathan Wakely  <jwakely.gcc@gmail.com>
+
+	PR libstdc++/53678
+	* config/os/bsd/netbsd/ctype_base.h: Check for _CTYPE_U.
+	* testsuite/22_locale/ctype_base/53678.cc: New.
+
 2012-06-15  Jonathan Wakely  <jwakely.gcc@gmail.com>
 
 	PR libstdc++/53578
diff --git a/libstdc++-v3/config/os/bsd/netbsd/ctype_base.h b/libstdc++-v3/config/os/bsd/netbsd/ctype_base.h
index d75cb79aaf6..cd654d685c5 100644
--- a/libstdc++-v3/config/os/bsd/netbsd/ctype_base.h
+++ b/libstdc++-v3/config/os/bsd/netbsd/ctype_base.h
@@ -1,6 +1,6 @@
 // Locale support -*- C++ -*-
 
-// Copyright (C) 2000, 2009 Free Software Foundation, Inc.
+// Copyright (C) 2000, 2009, 2011, 2012 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
@@ -31,8 +31,6 @@
 //   anoncvs@anoncvs.netbsd.org:/cvsroot/basesrc/include/ctype.h
 // See www.netbsd.org for details of access.
   
-#include <sys/param.h>
-
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -47,7 +45,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     // on the mask type. Because of this, we don't use an enum.
     typedef unsigned char      	mask;
 
-#if __NetBSD_Version__ < 599004100
+#ifndef _CTYPE_U
     static const mask upper    	= _U;
     static const mask lower 	= _L;
     static const mask alpha 	= _U | _L;
diff --git a/libstdc++-v3/testsuite/22_locale/ctype_base/53678.cc b/libstdc++-v3/testsuite/22_locale/ctype_base/53678.cc
new file mode 100644
index 00000000000..e4a9f071b92
--- /dev/null
+++ b/libstdc++-v3/testsuite/22_locale/ctype_base/53678.cc
@@ -0,0 +1,28 @@
+// Copyright (C) 2012 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/>.
+
+// { dg-do compile }
+
+// 22.2.1 The ctype category
+
+#include <locale>
+
+// libstdc++/53678
+void test01()
+{
+  bool NetBSD __attribute__((unused)) = true;
+}