diff --git a/lib/Alchemy/Phrasea/Setup/DoctrineMigrations/Version20180614113404.php b/lib/Alchemy/Phrasea/Setup/DoctrineMigrations/Version20180614113404.php
new file mode 100644
index 0000000000..bd360623df
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Setup/DoctrineMigrations/Version20180614113404.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Alchemy\Phrasea\Setup\DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+
+/**
+ * Migration script for old guest account
+ */
+class Version20180614113404 extends AbstractMigration
+{
+    /**
+     * @param Schema $schema
+     */
+    public function doUpSql(Schema $schema)
+    {
+        $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'mysql', 'Migration can only be executed safely on \'mysql\'.');
+
+        $this->addSql('UPDATE Users SET guest = 1 WHERE login LIKE "guest%"');
+    }
+
+    /**
+     * @param Schema $schema
+     */
+    public function doDownSql(Schema $schema)
+    {
+    }
+}