diff --git a/tox.ini b/tox.ini
index 84be8f949..cedba2f11 100644
--- a/tox.ini
+++ b/tox.ini
@@ -90,6 +90,7 @@ setenv =
     DATABASE_ENGINE=django.db.backends.mysql
     DATABASE_USER=wagtail
     DATABASE_HOST=localhost
+    DATABASE_USER=root
 
 [testenv:py33-dj17-postgres]
 basepython=python3.3
@@ -160,6 +161,7 @@ setenv =
     DATABASE_ENGINE=django.db.backends.mysql
     DATABASE_USER=wagtail
     DATABASE_HOST=localhost
+    DATABASE_USER=root
 
 [testenv:py33-dj18-postgres]
 basepython=python3.3