diff --git a/.travis.yml b/.travis.yml
index a43f27f4..1f8a2af7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,10 @@
 language: smalltalk
 sudo: false
+
+os:
+  - linux
+  - osx
+
 smalltalk:
   - Pharo-alpha
   - Pharo-6.1