diff --git a/includes/discovery/temperatures/observernms-custom.inc.php b/includes/discovery/temperatures/observernms-custom.inc.php
index 231cadf63..2508e8e6e 100644
--- a/includes/discovery/temperatures/observernms-custom.inc.php
+++ b/includes/discovery/temperatures/observernms-custom.inc.php
@@ -6,7 +6,9 @@ if ($device['os_group'] == "unix")
 {
   # FIXME snmp_walk
   # ObserverNMS-style temperature
-  $oids = shell_exec($config['snmpwalk'] . " -M " . $config['mibdir'] . " -M " . $config['mibdir'] . " -".$device['snmpver']." -m SNMPv2-SMI -Osqn -CI -c ".$device['community']." ".$device['transport'].":".$device['hostname'].":".$device['port']." .1.3.6.1.4.1.2021.7891 | sed s/.1.3.6.1.4.1.2021.7891.// | grep '.1.1 ' | grep -v '.101.' | cut -d'.' -f 1");
+  $cmd = $config['snmpwalk'] . " -M " . $config['mibdir'] . " -M " . $config['mibdir'] . " -".$device['snmpver']." -m SNMPv2-SMI -Osqn -CI -c ".$device['community']." ".$device['transport'].":".$device['hostname'].":".$device['port']." .1.3.6.1.4.1.2021.7891 | sed s/.1.3.6.1.4.1.2021.7891.// | grep '.1.1 ' | grep -v '.101.' | cut -d'.' -f 1";
+  if ($debug) { echo "$cmd\n"; }
+  $oids = shell_exec($cmd);
   $oids = trim($oids);
   if ($oids) echo("Observer-Style ");
   foreach (explode("\n",$oids) as $oid)
@@ -15,7 +17,7 @@ if ($device['os_group'] == "unix")
     if ($oid != "")
     {
       # FIXME snmp_get
-      $descr_query = $config['snmpget'] . " -M " . $config['mibdir'] . " -".$device['snmpver']." -m SNMPv2-SMI -Osqn -c ".$device['community']." ".$device['hostname'].":".$device['port']." .1.3.6.1.4.1.2021.7891.$oid.2.1 | sed s/.1.3.6.1.4.1.2021.7891.$oid.2.1\ //";
+      $descr_query = $config['snmpget'] . " -M " . $config['mibdir'] . " -".$device['snmpver']." -m SNMPv2-SMI -Osqn -c ".$device['community']." ".$device['transport'].':'.$device['hostname'].":".$device['port']." .1.3.6.1.4.1.2021.7891.$oid.2.1 | sed s/.1.3.6.1.4.1.2021.7891.$oid.2.1\ //";
       $descr = trim(str_replace("\"", "", shell_exec($descr_query)));
       $fulloid = ".1.3.6.1.4.1.2021.7891.$oid.101.1";
       discover_sensor($valid_sensor, 'temperature', $device, $fulloid, $oid, 'observium', $descr, '1', '1', NULL, NULL, NULL, NULL, $current);