diff --git a/test-requirements.txt b/test-requirements.txt
index 6aab4a2..97b52c3 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,3 @@
-hacking
 sphinx>=1.1.2,<1.2
 python-subunit
 stestr<3.0.0;python_version<'3.5'
diff --git a/tox.ini b/tox.ini
index 655d2c3..8544aa9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,8 @@ commands =
     stestr run --slowest {posargs}
 
 [testenv:pep8]
+deps =
+    hacking
 commands = flake8
 
 [testenv:docs]