diff --git a/setup.cfg b/setup.cfg
index 182e0054..746a64c9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -6,6 +6,8 @@ group = System Environment/Daemons
 
 [pytest]
 norecursedirs = examples lib local src
+testpaths = tests/
+addopts = --assert=plain
 
 [wheel]
 universal = 1
diff --git a/tox.ini b/tox.ini
index b18f9040..a9a8f968 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@ skipsdist = True
 
 [testenv]
 usedevelop = True
-commands = py.test {posargs:tests/} --assert=plain
+commands = py.test {posargs}
 deps =
   -rrequirements_test.txt
   py26: unittest2