diff --git a/tox.ini b/tox.ini
index 8f65d452e..84be8f949 100644
--- a/tox.ini
+++ b/tox.ini
@@ -89,6 +89,7 @@ deps =
 setenv =
     DATABASE_ENGINE=django.db.backends.mysql
     DATABASE_USER=wagtail
+    DATABASE_HOST=localhost
 
 [testenv:py33-dj17-postgres]
 basepython=python3.3
@@ -158,6 +159,7 @@ deps =
 setenv =
     DATABASE_ENGINE=django.db.backends.mysql
     DATABASE_USER=wagtail
+    DATABASE_HOST=localhost
 
 [testenv:py33-dj18-postgres]
 basepython=python3.3