diff --git a/sitecustomize.py b/sitecustomize.py
deleted file mode 100644
index 9b5135d..0000000
--- a/sitecustomize.py
+++ /dev/null
@@ -1,9 +0,0 @@
-"""Setup coverage tracking for subprocesses.
-
-Any ImportError is silently ignored.
-Requires COVERAGE_PROCESS_START in the environments, which gets set in
-tox.ini.
-"""
-import coverage
-
-coverage.process_startup()
diff --git a/tox.ini b/tox.ini
index ae43d6e..97aae1f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,6 +26,7 @@ deps =
     dj21: django>=2.1a1,<2.2
     djmaster: https://github.com/django/django/archive/master.tar.gz#egg=django
     py27,pypy: mock
+    coverage_enable_subprocess
 
 commands =
     python --version