diff --git a/rebar.config.script b/rebar.config.script
index c1e9325..c5d8d92 100644
--- a/rebar.config.script
+++ b/rebar.config.script
@@ -1,7 +1,7 @@
 case os:getenv("JSX_NOMAPS") or proplists:get_value(jsx_nomaps, CONFIG, false) of
   false ->
     try file:script("config/maps") of
-      {ok, true} -> [{erl_opts, [{d, release_supports_maps}]}] ++ CONFIG;
+      {ok, true} -> [{erl_opts, [{d, maps_support}]}] ++ CONFIG;
       _ -> CONFIG
     catch _:_ -> CONFIG
     end;
diff --git a/src/jsx_encoder.erl b/src/jsx_encoder.erl
index 349da5f..12e5866 100644
--- a/src/jsx_encoder.erl
+++ b/src/jsx_encoder.erl
@@ -39,11 +39,11 @@ encode(Term) -> encode(Term, ?MODULE).
 
 -spec encode(Term::any(), EntryPoint::module()) -> any().
 
--ifndef(release_supports_maps).
+-ifndef(maps_support).
 encode(Term, EntryPoint) -> encode_(Term, EntryPoint).
 -endif.
 
--ifdef(release_supports_maps).
+-ifdef(maps_support).
 encode(Map, _EntryPoint) when is_map(Map), map_size(Map) < 1 -> [start_object, end_object];
 encode(Term, EntryPoint) when is_map(Term) ->
     lists:flatten(
@@ -72,7 +72,7 @@ unzip(List) -> unzip(List, []).
 unzip([], Acc) -> lists:reverse(Acc);
 unzip([{K, V}|Rest], Acc) when is_binary(K); is_atom(K); is_integer(K) -> unzip(Rest, [V, K] ++ Acc).
 
--ifdef(release_supports_maps).
+-ifdef(maps_support).
 unpack(Map) -> unpack(maps:keys(Map), Map, []).
 
 unpack([], _, Acc) -> lists:reverse(Acc);