diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 660099780ac4..8785968d9fbe 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,9 @@
+2007-04-08  Alexey Beshenov  <bav.272304@gmail.com>
+
+	PR libstdc++/31511
+	* include/c_global/cmath.tcc (__cmath_power): Use _Tp(1).
+	* include/c_std/cmath.tcc (__cmath_power): Likewise.
+
 2007-04-06  Paolo Carlini  <pcarlini@suse.de>
 
 	PR libstdc++/31117
diff --git a/libstdc++-v3/include/c_global/cmath.tcc b/libstdc++-v3/include/c_global/cmath.tcc
index ff875640caf5..3e1bc50a17c5 100644
--- a/libstdc++-v3/include/c_global/cmath.tcc
+++ b/libstdc++-v3/include/c_global/cmath.tcc
@@ -1,6 +1,7 @@
 // -*- C++ -*- C math library.
 
-// Copyright (C) 2000, 2003, 2004, 2006 Free Software Foundation, Inc.
+// Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+// 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
@@ -42,7 +43,7 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
     inline _Tp
     __cmath_power(_Tp __x, unsigned int __n)
     {
-      _Tp __y = __n % 2 ? __x : 1;
+      _Tp __y = __n % 2 ? __x : _Tp(1);
 
       while (__n >>= 1)
         {
diff --git a/libstdc++-v3/include/c_std/cmath.tcc b/libstdc++-v3/include/c_std/cmath.tcc
index 472324af03ed..a7946301e2a6 100644
--- a/libstdc++-v3/include/c_std/cmath.tcc
+++ b/libstdc++-v3/include/c_std/cmath.tcc
@@ -1,6 +1,7 @@
 // -*- C++ -*- C math library.
 
-// Copyright (C) 2000, 2003, 2004, 2006 Free Software Foundation, Inc.
+// Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+// 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
@@ -42,7 +43,7 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
     inline _Tp
     __cmath_power(_Tp __x, unsigned int __n)
     {
-      _Tp __y = __n % 2 ? __x : 1;
+      _Tp __y = __n % 2 ? __x : _Tp(1);
 
       while (__n >>= 1)
         {