diff --git a/setup.py b/setup.py
index 6eab1998..3ffe4bef 100644
--- a/setup.py
+++ b/setup.py
@@ -126,6 +126,14 @@ def run(self):
     ],
     python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
     extras_require={
+        'testing': [
+            'fields',
+            'hunter',
+            'process-tests==2.0.0',
+            'pytest-xdist==1.25.0',
+            'six',
+            'virtualenv',
+        ]
     },
     entry_points={
         'pytest11': [
diff --git a/tox.ini b/tox.ini
index b0933ed8..8b15169f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,7 @@ envlist =
     docs
 
 [testenv]
+extras = testing
 basepython =
     pypy: {env:TOXPYTHON:pypy}
     pypy3: {env:TOXPYTHON:pypy3}
@@ -25,16 +26,9 @@ deps =
     t310: pytest==3.10.1
     t40: pytest==4.0.2
     t41: pytest==4.1.1
-    pytest-xdist==1.25.0
 
     c44: coverage==4.4.2
     c45: coverage==4.5.2
-
-    virtualenv
-    hunter
-    process-tests==2.0.2
-    six
-    fields
 pip_pre = true
 
 commands =