diff --git a/includes/discovery/current/apc.inc.php b/includes/discovery/current/apc.inc.php
index 2f78deed9b..07b4b629b5 100644
--- a/includes/discovery/current/apc.inc.php
+++ b/includes/discovery/current/apc.inc.php
@@ -100,7 +100,7 @@ if ($device['os'] == "apc")
         $lowlimit  = snmp_get($device, $lowlimit_oid, "-Oqv", "");
         $warnlimit = snmp_get($device, $warnlimit_oid, "-Oqv", "");
 
-        if ($limit < 0 && $lowlimit < 0 && $warnlimit < 0)
+        if ($limit != -1 && $lowlimit != -1 && $warnlimit != -1)
             discover_sensor($valid['sensor'], 'current', $device, $current_oid, $index, $type, $descr, '10', '1', $lowlimit, NULL, $warnlimit, $limit, $current);
       }
     }