diff --git a/mix.exs b/mix.exs
index f7c74a4e9..a13d6b782 100644
--- a/mix.exs
+++ b/mix.exs
@@ -34,7 +34,7 @@ defmodule Ejabberd.Mixfile do
 
   defp erlc_options do
     # Use our own includes + includes from all dependencies
-    includes = ["include"] ++ deps_include(["fast_xml", "xmpp"])
+    includes = ["include"] ++ deps_include(["fast_xml", "xmpp", "p1_utils"])
     [:debug_info, {:d, :ELIXIR_ENABLED}] ++ Enum.map(includes, fn(path) -> {:i, path} end)
   end