diff --git a/lib/SNMP/Info/Layer3/Rotek.pm b/lib/SNMP/Info/Layer3/Rotek.pm
index 58fcb15c..e294baa5 100755
--- a/lib/SNMP/Info/Layer3/Rotek.pm
+++ b/lib/SNMP/Info/Layer3/Rotek.pm
@@ -40,7 +40,7 @@ sub os {
 sub os_ver {
     my $obj = shift;
     my $os_ver;
-    my $os_ver_oid = $obj->description();
+    my $os_ver_oid = $obj->description;
         $os_ver_oid =~ /\,\s(.*)/;
         $os_ver = $1;
 
@@ -61,6 +61,11 @@ sub model {
     return $obj->SUPER::model();
 }
 
+sub serial {
+    my $obj = shift;
+    return $obj->SUPER::serial();
+}
+
 1;
 __END__