diff --git a/samba.spec b/samba.spec
index 11cd528..f1ef370 100644
--- a/samba.spec
+++ b/samba.spec
@@ -1628,7 +1628,8 @@ fi
 %service_add_pre ctdb.service
 %endif
 if [ -e %{_sysconfdir}/sysconfig/ctdb ] ; then
-	sed -i s/CTDB_LOGFILE=/CTDB_LOGGING=file:/g %{_sysconfdir}/sysconfig/ctdb
+    grep CTDB_LOGGING %{_sysconfdir}/sysconfig/ctdb >/dev/null 2>&1 ||
+    	sed -i s/CTDB_LOGFILE=/CTDB_LOGGING=file:/g %{_sysconfdir}/sysconfig/ctdb
 fi
 
 %preun -n ctdb