diff --git a/rebar.config.script b/rebar.config.script
index ce4ca9f..4d5ec7f 100644
--- a/rebar.config.script
+++ b/rebar.config.script
@@ -1,7 +1,7 @@
 case os:getenv("JSX_NOMAPS") of
   false ->
     try file:script("config/maps") of {ok, true} ->
-      [{d, release_supports_maps}] ++ CONFIG
+      [{erl_opts, [{d, release_supports_maps}]}] ++ CONFIG
     catch _:_ -> CONFIG
     end;
   _ -> CONFIG