diff --git a/zabbix_scripts/check_lvm_sudo b/zabbix_scripts/check_lvm_sudo
index 6f64f2e..bd71346 100644
--- a/zabbix_scripts/check_lvm_sudo
+++ b/zabbix_scripts/check_lvm_sudo
@@ -43,6 +43,10 @@ EOF
 my $json;
 if (defined $vg){
   %{$json} = get_volume_group_information($vg);
+  # Depending on LVM version, alloc_ct might not be present
+  if (not defined $json->{alloc_ct}){
+    $json->{alloc_ct} = sprintf("%.1f", 100 * $json->{alloc_pe_size} / $json->{vg_size});
+  }
 } elsif (defined $lv) {
   %{$json} = get_lv_info($lv);
 } else{