diff --git a/at-3.1.14-usePOSIXtimers.patch b/at-3.1.14-usePOSIXtimers.patch
index ebf7d8d..89c5614 100644
--- a/at-3.1.14-usePOSIXtimers.patch
+++ b/at-3.1.14-usePOSIXtimers.patch
@@ -5,7 +5,7 @@ diff -up at-3.1.14/atd.c.timers at-3.1.14/atd.c
      return next_job;
  }
  
-+#ifdef HAVE_CLOCK_GETTIME
++#ifdef HAVE_TIMER_CREATE
 +timer_t timer;
 +struct itimerspec timeout;
 +
@@ -89,7 +89,7 @@ diff -up at-3.1.14/config.h.in.timers at-3.1.14/config.h.in
  /* Define to 1 if you have the `getloadavg' function. */
  #undef HAVE_GETLOADAVG
  
-+/* Define to 1 if you have the `clock_gettime' function. */
++/* Define to 1 if you have the `timer_create' function. */
 +#undef HAVE_TIMER_CREATE
 +
  /* Define to 1 if you have the <getopt.h> header file. */
diff --git a/at.spec b/at.spec
index 0f0047c..1691768 100644
--- a/at.spec
+++ b/at.spec
@@ -3,7 +3,7 @@
 Summary:	Job spooling tools
 Name:		at
 Version:	3.1.20
-Release:	3%{?dist}
+Release:	4%{?dist}
 # http://packages.debian.org/changelogs/pool/main/a/at/current/copyright
 # + install-sh is MIT license with changes under Public Domain
 License:	GPLv3+ and GPLv2+ and ISC and MIT and Public Domain
@@ -179,6 +179,9 @@ chown daemon:daemon %{_localstatedir}/spool/at/.SEQ
 %attr(0644,root,root)		/%{_unitdir}/atd.service
 
 %changelog
+* Tue Mar 28 2017 Tomáš Mráz <tmraz@redhat.com> - 3.1.20-4
+- fix the POSIX timers support (#1436523)
+
 * Fri Feb 10 2017 Fedora Release Engineering <releng@fedoraproject.org> - 3.1.20-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild