diff --git a/src/MetaModels/Attribute/CombinedValues/CombinedValues.php b/src/MetaModels/Attribute/CombinedValues/CombinedValues.php
index <HASH>..<HASH> 100644
--- a/src/MetaModels/Attribute/CombinedValues/CombinedValues.php
+++ b/src/MetaModels/Attribute/CombinedValues/CombinedValues.php
@@ -35,7 +35,7 @@ class CombinedValues extends BaseSimple
      */
     public function getSQLDataType()
     {
-        return 'varchar(255) NOT NULL default \'\'';
+        return 'text NULL';
     }
 
     /**
Change filed type to text (issue #7)