diff --git a/includes/alerts/transport.nagios.php b/includes/alerts/transport.nagios.php
index df943baf2..cac5e5179 100644
--- a/includes/alerts/transport.nagios.php
+++ b/includes/alerts/transport.nagios.php
@@ -40,8 +40,8 @@ $format .= $obj['timestamp']."\t";
 $format .= $obj['hostname']."\t";
 $format .= md5($obj['rule'])."\t"; //FIXME: Better entity
 $format .= ($obj['state'] ? $obj['severity'] : "ok")."\t";
-$format .= 0."\t";
-$format .= 0."\t";
+$format .= "0\t";
+$format .= "0\t";
 $format .= str_replace("\n","",nl2br($obj['msg']))."\t";
 $format .= "NULL"; //FIXME: What's the HOSTPERFDATA equivalent for LibreNMS? Oo
 $format .= "\n";