diff --git a/.travis.yml b/.travis.yml
index f04132d07..d67e45df7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,4 +8,4 @@ env:
   - MRUBY_CONFIG=travis_config.rb
 
 script:
-  - rake -m && rake test
+  - rake gensym && rake -m && rake test