diff --git a/.travis.yml b/.travis.yml
index 0cfc81e..532655e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -96,12 +96,13 @@ matrix:
     - env: TOXENV="djangodev"
 
 before_install:
-- pip install codecov tox
+- pip install codecov coverage==3.6 tox
 
 script:
   - tox
 
 after_success:
+- coverage xml -i
 - codecov
 
 branches:
diff --git a/tox.ini b/tox.ini
index 0b79eca..cff1ea7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,7 +23,6 @@ deps =
     djangodev: https://github.com/django/django/tarball/master
 commands=
     coverage run --source polymorphic runtests.py
-    coverage xml -i
 
 [testenv:docs]
 deps=Sphinx