diff --git a/test/test_helper.rb b/test/test_helper.rb
index a14a277..671e042 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -13,6 +13,7 @@ mode = :strict
 if ARGV.last == 'lax'
   puts "-- LAX ERROR MODE"
   ARGV.pop
+  ARGV.compact! # because things break on Rubinius otherwise
   mode = :lax
 else
   puts "-- STRICT ERROR MODE"