diff --git a/filters.inc.php b/filters.inc.php
index b83739c..6e03e0e 100644
--- a/filters.inc.php
+++ b/filters.inc.php
@@ -86,18 +86,14 @@ function flt_class($val, $name, $struct, $args)
 
     $conf_path = \taskman\config_real_path($conf_path);
     
-    $lines = file($conf_path);
-    foreach($lines as $line)
-    {
-      if(preg_match('~"?class"?\s*:\s*"([^"]+)"~', $line, $matches))
-      {
-        $conf_class = $matches[1];
-        if($conf_class != $args[0] && !is_subclass_of($conf_class, $args[0]))
-          throw new Exception($val.". Config class is \"".$conf_class."\". Must be \"".$args[0]."\" or it's child");
-        else  
-         return $val;  
-      }
-    }
+    $cce = \taskman\config_fetch_by_path($conf_path);
+
+    $conf_class = $cce->class;
+    
+    if($conf_class != $args[0] && !is_subclass_of($conf_class, $args[0]))
+      throw new Exception($val.". Config class is \"".$conf_class."\". Must be \"".$args[0]."\" or it's child");
+    else  
+     return $val;
     
     throw new Exception($val.". Config class is not found in '$conf_path'");
   }