diff --git a/includes/database/mysql/database.inc b/includes/database/mysql/database.inc
index b91d1d4..6a0d8e2 100644
--- a/includes/database/mysql/database.inc
+++ b/includes/database/mysql/database.inc
@@ -26,6 +26,9 @@ class DatabaseConnection_mysql extends DatabaseConnection {
     }
 
     $dsn = 'mysql:host=' . $connection_options['host'] . ';port=' . $connection_options['port'] . ';dbname=' . $connection_options['database'];
+    if (isset($connection_options['unix_socket'])) {
+      $dsn .= ';unix_socket=' . $connection_options['unix_socket'];
+    }
     parent::__construct($dsn, $connection_options['username'], $connection_options['password'], array(
       // So we don't have to mess around with cursors and unbuffered queries by default.
       PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,