diff --git a/ChangeLog b/ChangeLog
index d5d9222..dae074c 100755
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,4 @@
-2020-11-07
+2020-11-17
 
         * Version 2.0.0 released
         ========================
@@ -6,6 +6,7 @@
         Add models() method to ctobssim (#3441)
         Add ctlike results to XML file (#3431)
         Fix implementation of fix_spat_for_ts parameter in ctlike (#3426)
+        Replace std::tmpnam() by gammalib::tmpnam() function in ctselect (#3324)
 
 
 2020-09-04
diff --git a/NEWS b/NEWS
index edf6ed2..19c8b01 100755
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,6 @@
 New Features and Important Changes in ctools 2.0.0
 
-7 November 2020
+17 November 2020
 
 
 Introduction
@@ -118,7 +118,7 @@ None
 
 ctselect - CTA event selection
 ------------------------------
-None
+Replaced std::tmpnam() by gammalib::tmpnam() function in ctselect (#3324).
 
 
 ctskymap - CTA sky mapping
diff --git a/README.md b/README.md
index bad16ad..1352f30 100755
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 ctools information
 ==================
-* Version:             2.0.0.dev (7 November 2020)
+* Version:             2.0.0.dev (17 November 2020)
 * GammaLib dependency: 2.0.0.dev
 
 [![Build Status](https://cta-jenkins.irap.omp.eu/buildStatus/icon?job=ctools-integrate-os)](https://cta-jenkins.irap.omp.eu/job/ctools-integrate-os/)
diff --git a/configure.ac b/configure.ac
index 943544e..a4aadb1 100755
--- a/configure.ac
+++ b/configure.ac
@@ -31,9 +31,8 @@
 AC_INIT([ctools], [2.0.0.dev], [jurgen.knodlseder@irap.omp.eu], [ctools])
 AC_CONFIG_SRCDIR([src/ctselect/ctselect.cpp])
 AC_CONFIG_MACRO_DIR([m4])
-#AM_INIT_AUTOMAKE([gnu no-dependencies foreign])
-AM_INIT_AUTOMAKE([gnu -Wno-portability foreign])
-#AM_INIT_AUTOMAKE([gnu -Wno-portability foreign serial-tests])
+#AM_INIT_AUTOMAKE([gnu -Wno-portability foreign])
+AM_INIT_AUTOMAKE([gnu -Wno-portability foreign serial-tests])
 AC_CONFIG_HEADER([config.h])
 
 
diff --git a/doc/source/admin/release_history/2.0.rst b/doc/source/admin/release_history/2.0.rst
index dc69fc5..5de4ad7 100644
--- a/doc/source/admin/release_history/2.0.rst
+++ b/doc/source/admin/release_history/2.0.rst
@@ -1,7 +1,7 @@
 .. _2.0:
 
-ctools 2.0 release (7 November 2020)
-====================================
+ctools 2.0 release (17 November 2020)
+=====================================
 
 Overview
 --------
@@ -28,6 +28,8 @@ Improvements
   Add ``models()`` method to :ref:`ctobssim`
 * [`3431 <https://cta-redmine.irap.omp.eu/issues/3431>`_] -
   Add :ref:`ctlike` results to XML file
+* [`3324 <https://cta-redmine.irap.omp.eu/issues/3324>`_] -
+  Replace ``std::tmpnam()`` by ``gammalib::tmpnam()`` function in :ref:`ctselect`
 
 
 New features
diff --git a/src/ctselect/ctselect.cpp b/src/ctselect/ctselect.cpp
index 0a266a9..91f7ad1 100755
--- a/src/ctselect/ctselect.cpp
+++ b/src/ctselect/ctselect.cpp
@@ -1,7 +1,7 @@
 /***************************************************************************
  *                      ctselect - Data selection tool                     *
  * ----------------------------------------------------------------------- *
- *  copyright (C) 2010-2018 by Juergen Knoedlseder                         *
+ *  copyright (C) 2010-2020 by Juergen Knoedlseder                         *
  * ----------------------------------------------------------------------- *
  *                                                                         *
  *  This program is free software: you can redistribute it and/or modify   *
@@ -42,7 +42,6 @@
 /* __ Debug definitions __________________________________________________ */
 
 /* __ Coding definitions _________________________________________________ */
-//#define G_USE_MKSTEMP               //!< Use mkstemp for temporary filename
 
 
 /*==========================================================================
@@ -297,13 +296,7 @@ void ctselect::run(void)
         }
 
         // Get temporary file name
-        #if G_USE_MKSTEMP
-        char tpl[]  = "ctselectXXXXXX";
-        int  fileid = mkstemp(tpl);
-        std::string filename(tpl);
-        #else
-        std::string filename = std::tmpnam(NULL);
-        #endif
+        std::string filename = gammalib::tmpnam();
 
         // Save observation in temporary file. We add here the events and
         // GTI extension name so that the GCTAObservation::save method can
@@ -330,11 +323,6 @@ void ctselect::run(void)
         // Load observation from temporary file, including event selection
         select_events(obs, filename, m_evtname[i], m_gtiname[i]);
 
-        // Close temporary file
-        #if G_USE_MKSTEMP
-        close(fileid);
-        #endif
-
         // Remove temporary file
         std::remove(filename.c_str());