diff --git a/cyrus-imapd.spec b/cyrus-imapd.spec
index 6188683..81a6791 100644
--- a/cyrus-imapd.spec
+++ b/cyrus-imapd.spec
@@ -1,6 +1,6 @@
 Name: cyrus-imapd
 Version: 2.4.16
-Release: 4%{?dist}
+Release: 5%{?dist}
 
 %define ssl_pem_file %{_sysconfdir}/pki/%{name}/%{name}.pem
 
@@ -146,9 +146,10 @@ find . -type f -name "*.pl" | xargs %{__perl} -pi -e "s@/usr/local/bin/perl@%{__
 find . -type f -name "*.pl" -exec chmod 755 {} \;
 
 %build
-CPPFLAGS="$RPM_OPT_FLAGS -I%{_includedir}/et -I%{_includedir}/kerberosIV"; export CPPFLAGS
-CFLAGS="$RPM_OPT_FLAGS -fPIC"; export CFLAGS
+CPPFLAGS="$RPM_OPT_FLAGS -I%{_includedir}/et -I%{_includedir}/kerberosIV -fno-strict-aliasing"; export CPPFLAGS
+CFLAGS="$RPM_OPT_FLAGS -fPIC -fno-strict-aliasing"; export CFLAGS
 CCDLFLAGS="-rdynamic"; export CCDLFLAGS
+LDFLAGS="-Wl,-z,now -Wl,-z,relro"
 %ifnarch ppc ppc64
 LDFLAGS="$LDFLAGS -pie"; export LDFLAGS
 %endif
@@ -468,6 +469,9 @@ fi
 %{_mandir}/man1/*
 
 %changelog
+* Fri Nov 30 2012 Michal Hlavinka <mhlavink@redhat.com> - 2.4.16-5
+- do not use strict aliasing
+
 * Tue Aug 21 2012 Michal Hlavinka <mhlavink@redhat.com> - 2.4.16-4
 - use new systemd rpm macros (#850079)
 
@@ -781,8 +785,6 @@ fi
 - bring up to Simon Matter's 2.3.1-2 release
 - fix bug #173319, require cyrus-sasl-lib instead of cyrus-sasl
 - fix bug #176470, hardcoded disttag
-
-* Wed Jan 25 2006 Simon Matter <simon.matter@invoca.ch> 2.3.1-2
 - add backend_sigsegv patch
 - add replication_policycheck patch