diff --git a/puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_send_receive_time b/puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_send_receive_time
index 1ef3746597..f4ec235756 100755
--- a/puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_send_receive_time
+++ b/puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_send_receive_time
@@ -190,10 +190,10 @@ while msg_to_send not in msg_content:
 zulip_recipient.deregister(queue_id)
 
 if options.nagios:
+    if time_diff.seconds > 12:
+        report('CRITICAL', time_diff)
     if time_diff.seconds > 3:
         report('WARNING', time_diff)
-    if time_diff.seconds > 6:
-        report('CRITICAL', time_diff)
 
 if options.munin:
     print("sendreceive.value %s" % total_seconds(time_diff))