diff --git a/.travis.yml b/.travis.yml
index e7fcd8b5d1..b34b17af75 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,7 +24,7 @@ matrix:
     env: TOX_ENV=py36
 
   - python: 3.6
-    env: TOX_ENV=isort
+    env: TOX_ENV=check_isort
 
   - python: 3.6
     env: TOX_ENV=check-newsfragment
diff --git a/tox.ini b/tox.ini
index c7491690c5..ed26644bd9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = packaging, py27, py36, pep8, isort
+envlist = packaging, py27, py36, pep8, check_isort
 
 [testenv]
 deps =
@@ -103,7 +103,7 @@ deps =
     flake8
 commands = /bin/sh -c "flake8 synapse tests {env:PEP8SUFFIX:}"
 
-[testenv:isort]
+[testenv:check_isort]
 skip_install = True
 deps = isort
 commands = /bin/sh -c "isort -c -sp setup.cfg -rc synapse tests"