diff --git a/tox.ini b/tox.ini
index fb37e8f..2777745 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 envlist=django1.8-py3.4,django1.8-py2.7,django1.7-py2.7,django1.7-py3.4
 
 [testenv]
-commands=bash -exc "python manage.py test ckeditor_demo"
+commands=bash -exc "export DISPLAY=:0;python manage.py test ckeditor_demo"
 whitelist_externals=/bin/bash
 setenv=DJANGO_SETTINGS_MODULE=ckeditor_demo.settings
 deps=