diff --git a/pfsense_zbx.php b/pfsense_zbx.php
index 01cfb3b..6dbf4d1 100644
--- a/pfsense_zbx.php
+++ b/pfsense_zbx.php
@@ -471,7 +471,7 @@ function pfz_service_value($name,$value){
                          $status = get_service_status($service);
                          if ($status=="") $status = 0;
                          // Don't trigger for disabled services
-                         if (is_service_enabled($service['name'])) $status = 1;
+                         if (!is_service_enabled($service['name'])) $status = 1;
                          echo $status;
                          return;