diff --git a/modules/service/classes/Model/Service.php b/modules/service/classes/Model/Service.php
index 6fcd852a..e0be10d5 100644
--- a/modules/service/classes/Model/Service.php
+++ b/modules/service/classes/Model/Service.php
@@ -210,14 +210,9 @@ class Model_Service extends ORM_OSB {
 
 		$cats = ORM::factory('Product_Category')->list_bylistgroup($cat);
 
-		foreach ($this->list_active() as $so) {
-			if (! $so->product->avail_category OR ! preg_match('/^a:/',$so->product->avail_category))
-				continue;
-
-			$pc = unserialize($so->product->avail_category);
-			if (array_intersect($pc,array_keys($cats)))
+		foreach ($this->list_active() as $so)
+			if (array_intersect($so->product->avail_category,array_keys($cats)))
 				array_push($result,$so);
-		}
 
 		return $result;
 	}