diff --git a/library/Director/Db.php b/library/Director/Db.php
index 703d6e43..bec0de3e 100644
--- a/library/Director/Db.php
+++ b/library/Director/Db.php
@@ -632,6 +632,25 @@ class Db extends DbConnection
         return $this->db()->fetchAll($select);
     }
 
+    public function fetchDistinctServiceVars()
+    {
+        $select = $this->db()->select()->distinct()->from(
+            array('sv' => 'icinga_service_var'),
+            array(
+                'varname'  => 'sv.varname',
+                'format'   => 'sv.format',
+                'caption'  => 'df.caption',
+                'datatype' => 'df.datatype'
+            )
+        )->joinLeft(
+            array('df' => 'director_datafield'),
+            'df.varname = sv.varname',
+            array()
+        )->order('varname');
+
+        return $this->db()->fetchAll($select);
+    }
+
     public function dbHexFunc($column)
     {
         if ($this->isPgsql()) {
diff --git a/library/Director/Objects/IcingaService.php b/library/Director/Objects/IcingaService.php
index 9e6a90f4..7564f4b6 100644
--- a/library/Director/Objects/IcingaService.php
+++ b/library/Director/Objects/IcingaService.php
@@ -435,7 +435,7 @@ class IcingaService extends IcingaObject
         $serviceVars = array();
 
         if ($connection !== null) {
-            foreach ($connection->fetchDistinctHostVars() as $var) {
+            foreach ($connection->fetchDistinctServiceVars() as $var) {
                 if ($filter->match(PropertiesFilter::$CUSTOM_PROPERTY, $var->varname, $var)) {
                     if ($var->datatype) {
                         $serviceVars[$prefix . 'vars.' . $var->varname] = sprintf(