diff --git a/.travis.yml b/.travis.yml
index fbca476d..56e79126 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ language: ruby
 env:
   global:
     - RUBY_GC_MALLOC_LIMIT=90000000
-    - RUBY_FREE_MIN=200000
+    - RUBY_GC_HEAP_FREE_SLOTS=200000
 rvm:
   - 2.1.2
 addons: