diff --git a/rel/reltool.config b/rel/reltool.config
index 33d985545..1c0fc3356 100644
--- a/rel/reltool.config
+++ b/rel/reltool.config
@@ -56,7 +56,6 @@
        {app, inets, [{incl_cond, include}]},
        {app, compiler, [{incl_cond, include}]},
        {app, runtime_tools, [{incl_cond, include}]},
-       {app, observer, [{incl_cond, include}]},
        {app, goldrush, [{incl_cond, include}]},
        {app, gen_logger, [{incl_cond, include}]},
        {app, lager, [{incl_cond, include}]},