diff --git a/.travis.yml b/.travis.yml
index 22369a8..ddd16cb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,9 @@
 language: d
 
+os:
+    - linux
+    - osx
+
 d:
   # order: latest DMD, oldest DMD, LDC/GDC, remaining DMD versions
   # this way the overall test time gets cut down (GDC/LDC are a lot