diff --git a/lib/Doctrine/DataDict/Firebird.php b/lib/Doctrine/DataDict/Firebird.php
index 6bd0b1e41..48a6857a5 100644
--- a/lib/Doctrine/DataDict/Firebird.php
+++ b/lib/Doctrine/DataDict/Firebird.php
@@ -67,6 +67,7 @@ class Doctrine_DataDict_Firebird extends Doctrine_DataDict
             case 'object':
             case 'char':
             case 'text':
+            case 'gzip':
                 $length = !empty($field['length'])
                     ? $field['length'] : 16777215; // TODO: $this->conn->options['default_text_field_length'];
 
diff --git a/lib/Doctrine/DataDict/Mssql.php b/lib/Doctrine/DataDict/Mssql.php
index ec2ca132b..bbdc37e26 100644
--- a/lib/Doctrine/DataDict/Mssql.php
+++ b/lib/Doctrine/DataDict/Mssql.php
@@ -69,6 +69,7 @@ class Doctrine_DataDict_Mssql extends Doctrine_DataDict
             case 'char':
             case 'varchar':
             case 'string':
+            case 'gzip':
                 $length = !empty($field['length'])
                     ? $field['length'] : false;
 
diff --git a/lib/Doctrine/DataDict/Mysql.php b/lib/Doctrine/DataDict/Mysql.php
index 9c9204067..c58916cbe 100644
--- a/lib/Doctrine/DataDict/Mysql.php
+++ b/lib/Doctrine/DataDict/Mysql.php
@@ -147,7 +147,7 @@ class Doctrine_DataDict_Mysql extends Doctrine_DataDict
             case 'array':
             case 'object':
             case 'string':
-
+            case 'gzip':
                 if ( ! isset($field['length'])) {
                     if (array_key_exists('default', $field)) {
                         $field['length'] = $this->conn->varchar_max_length;