diff --git a/install/upgrades/3.4.9.sql b/install/upgrades/3.4.9.sql
new file mode 100644
index 00000000..64189d63
--- /dev/null
+++ b/install/upgrades/3.4.9.sql
@@ -0,0 +1,3 @@
+
+DELETE FROM default_subdomains WHERE domain_type="WEBMAIL";
+