diff --git a/includes/discovery/os/sentry3.inc.php b/includes/discovery/os/sentry3.inc.php
index 295d42c945..9e8b183fb3 100644
--- a/includes/discovery/os/sentry3.inc.php
+++ b/includes/discovery/os/sentry3.inc.php
@@ -6,8 +6,8 @@ if (!$os) {
         // ServerTech doesn't have a way to distinguish between sentry3 and sentry4 devices
         // Hopefully, we can use the version string to figure it out
         $version = trim(snmp_get($device, 'Sentry3-MIB::serverTech.4.1.1.1.3.0', '-Osqnv'));
-        $version = explode(" ", $version, 1);
-        $version = intval($version);
+        $version = explode(" ", $version);
+        $version = intval($version[1]);
 
         // It appears that version 8 and up is good for sentry4
         if ($version >= 8) {