diff --git a/rebar.config b/rebar.config
index 62c70852..83da0e57 100644
--- a/rebar.config
+++ b/rebar.config
@@ -23,6 +23,9 @@
 {escript_top_level_app, rebar}.
 {escript_name, rebar3}.
 {escript_emu_args, "%%! +sbtu +A0\n"}.
+%% escript_incl_extra is for internal rebar-private use only.
+%% Do not use outside rebar. Config interface is not stable.
+{escript_incl_extra, [{"priv/templates/*", "."}, {"rebar/include/*", "."}]}.
 
 {erl_opts,
  [{platform_define, "R14", no_callback_support},