diff --git a/ejabberd/templates/ejabberd.cfg.erb b/ejabberd/templates/ejabberd.cfg.erb
index e42a110..38eef24 100644
--- a/ejabberd/templates/ejabberd.cfg.erb
+++ b/ejabberd/templates/ejabberd.cfg.erb
@@ -249,7 +249,12 @@ override_acls.
 %% If you want to use a different method,
 %% comment this line and enable the correct ones.
 %%
+<% if ejabberd_extauth -%>
+{auth_method, external}.
+{extauth_program, "<%= ejabberd_extauth %>"}.
+<% else -%>
 {auth_method, internal}.
+<% end -%>
 
 %%
 %% Authentication using external script