diff --git a/code/MSSQLDatabase.php b/code/MSSQLDatabase.php
index ee742cb..92a6ba8 100644
--- a/code/MSSQLDatabase.php
+++ b/code/MSSQLDatabase.php
@@ -1046,6 +1046,20 @@ class MSSQLDatabase extends SS_Database {
 		return 'RAND()';
 	}
 	
+	/**
+	 * This is a lookup table for data types.
+	 * 
+	 * For instance, MSSQL uses 'BIGINT', while MySQL uses 'UNSIGNED'
+	 * and PostgreSQL uses 'INT'.
+	 */
+	function dbDataType($type){
+		$values = array(
+			'unsigned integer'=>'BIGINT'
+		);
+		if(isset($values[$type])) return $values[$type];
+		else return '';
+	}
+	
 	/**
 	 * Convert a SQLQuery object into a SQL statement.
 	 */