diff --git a/rebar.config.script b/rebar.config.script
index 4d5ec7f..a9a0f2b 100644
--- a/rebar.config.script
+++ b/rebar.config.script
@@ -1,7 +1,8 @@
 case os:getenv("JSX_NOMAPS") of
   false ->
-    try file:script("config/maps") of {ok, true} ->
-      [{erl_opts, [{d, release_supports_maps}]}] ++ CONFIG
+    try file:script("config/maps") of
+      {ok, true} -> [{erl_opts, [{d, release_supports_maps}]}] ++ CONFIG;
+      _ -> CONFIG
     catch _:_ -> CONFIG
     end;
   _ -> CONFIG