diff --git a/.travis.yml b/.travis.yml
index 5ba2269..ea5c5ea 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,8 @@ notifications:
   webhooks: http://basho-engbot.herokuapp.com/travis?key=9b0dc343d8addd889d7a8d64c9b8b48dd22370aa
   email: eng@basho.com
 otp_release:
+  - 18.2.1
+  - 17.5
   - R15B01
   - R15B
   - R14B04
diff --git a/src/js_benchmark.erl b/src/js_benchmark.erl
index 5b92553..071e005 100644
--- a/src/js_benchmark.erl
+++ b/src/js_benchmark.erl
@@ -38,9 +38,9 @@ run() ->
 %% @private
 time_calls(Ctx, Count) ->
     io:format("Starting: ~p~n", [Count]),
-    Start = erlang:now(),
+    Start = os:timestamp(),
     do_calls(Ctx, Count),
-    timer:now_diff(erlang:now(), Start) / Count.
+    timer:now_diff(os:timestamp(), Start) / Count.
 
 %% @private
 do_calls(_Ctx, 0) ->