diff --git a/postfix.changes b/postfix.changes
index 7488339..00ec54a 100644
--- a/postfix.changes
+++ b/postfix.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Fri Oct 14 16:43:02 CEST 2011 - mhrusecky@suse.cz
+
+- only fix files that exists in %post
+
 -------------------------------------------------------------------
 Sun Oct  9 04:30:54 UTC 2011 - crrodriguez@opensuse.org
 
diff --git a/postfix.spec b/postfix.spec
index c038d5f..eac1158 100644
--- a/postfix.spec
+++ b/postfix.spec
@@ -391,7 +391,7 @@ else
         fi
 fi
 # before fillup we need to fix something
-%{__sed} -i \
+[ \! -f %{_sysconfdir}/sysconfig/%{name} ] || %{__sed} -i \
  -e "s/POSTFIX_SMTPD_SENDERNT_RESTRICTIONS/POSTFIX_SMTPD_SENDER_RESTRICTIONS/" \
  %{_sysconfdir}/sysconfig/%{name}
 %{fillup_and_insserv -y postfix}