diff --git a/.travis.yml b/.travis.yml
index c41a8c4..d5251d7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,7 @@
 # Test build the arduino library with travis CI and PlatformIO
 language: python
+python:
+  - "2.7"
 
 # Cache PlatformIO packages using Travis CI container-based infrastructure
 sudo: false