diff --git a/.travis.yml b/.travis.yml
index 4b6feb95..69b4a5c1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -34,4 +34,5 @@ env:
     - DISPLAY=:99.0
     - COVERAGE_THRESHOLD=83
     - RUBY_GC_MALLOC_LIMIT=50000000
+    - WEBDRIVER_BROWSER=firefox
     - secure: nnTbf1vKvwZhbjyxbl5JFQhSahFlDPQDQ4MsF07YdLyxqoePUkq7TiMlq/KG+H/PBQ257PEUsCXqaiOqjqE5fXJEBMAxjiJO+H96fDvrk7ovsQTlNh7eJAGidGUDvXHKooFmRSWgODG2mA1WRaaq/HfK6PWeqeH9rbAefCpoFzc=