diff --git a/src/app/code/community/Smile/VirtualCategories/Model/Rule/Condition/Product.php b/src/app/code/community/Smile/VirtualCategories/Model/Rule/Condition/Product.php
index 64604213..fc362f4b 100644
--- a/src/app/code/community/Smile/VirtualCategories/Model/Rule/Condition/Product.php
+++ b/src/app/code/community/Smile/VirtualCategories/Model/Rule/Condition/Product.php
@@ -36,9 +36,9 @@ class Smile_VirtualCategories_Model_Rule_Condition_Product extends Mage_CatalogR
         '>='  => '#{field}:[#{value} TO *]',
         '<='  => '#{field}:[* TO #{value}]',
         '>'   => '#{field}:{#{value} TO *]',
-        '<'   => '#{field}:[* TO #{value}}',
-        '{}'  => '#{field}:#{value}*',
-        '!{}' => '#{field}:#{value}*'
+        '<'   => '#{field}:[* TO #{value}]',
+        '{}'  => '#{field}:*#{value}*',
+        '!{}' => '-(#{field}:*#{value}*)'
     );
 
     /**