diff --git a/maddy.go b/maddy.go
index 9b765803..16aa0eb0 100644
--- a/maddy.go
+++ b/maddy.go
@@ -294,6 +294,7 @@ func ReadGlobals(cfg []config.Node) (map[string]interface{}, []config.Node, erro
 	globals.String("hostname", false, false, "", nil)
 	globals.String("autogenerated_msg_domain", false, false, "", nil)
 	globals.Custom("tls", false, false, nil, tls.TLSDirective, nil)
+	globals.Custom("tls_client", false, false, nil, tls.TLSClientBlock, nil)
 	globals.Bool("storage_perdomain", false, false, nil)
 	globals.Bool("auth_perdomain", false, false, nil)
 	globals.StringList("auth_domains", false, false, nil, nil)