diff --git a/.travis.yml b/.travis.yml
index 58a0d0e..adfc4c5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,10 +17,10 @@ before_script:
       flake8 *.py src --count --select=E901,E999,F821,F822,F823 --statistics ;
     fi
 script:
-  - if [[ $TRAVIS_PYTHON_VERSION == 3.7 ]]; then
-      tox -e coverage ;
+  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then
+      tox -e no-dilate ;
     else
-      tox -e py ;
+      tox -e coverage ;
     fi
 after_success:
   - codecov
diff --git a/tox.ini b/tox.ini
index 09520a3..3c01425 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,7 @@ commands =
     wormhole --version
     python -m wormhole.test.run_trial {posargs:wormhole}
 
-[testenv:py27]
+[testenv:no-dilate]
 extras = dev
 
 # on windows, trial is installed as venv/bin/trial.py, not .exe, but (at