diff --git a/mix.exs b/mix.exs
index 7bffb55e5..4b732334e 100644
--- a/mix.exs
+++ b/mix.exs
@@ -27,7 +27,7 @@ defmodule Ejabberd.Mixfile do
     [mod: {:ejabberd_app, []},
      applications: [:kernel, :stdlib, :sasl, :ssl],
      included_applications: [:lager, :mnesia, :inets, :p1_utils, :cache_tab,
-                             :fast_tls, :stringprep, :fast_xml, :xmpp,
+                             :fast_tls, :stringprep, :fast_xml, :xmpp, :mqtree,
                              :stun, :fast_yaml, :esip, :jiffy, :p1_oauth2,
                              :eimp, :base64url, :jose, :pkix, :os_mon]
      ++ cond_apps()]