diff --git a/testing/acceptance_test.py b/testing/acceptance_test.py
index 69f83f4..5cf2d12 100644
--- a/testing/acceptance_test.py
+++ b/testing/acceptance_test.py
@@ -256,6 +256,7 @@ class TestDistribution:
                 time.sleep(10)
         """)
         child = testdir.spawn_pytest("-n1")
+        py.std.time.sleep(0.1)
         child.expect(".*test session starts.*")
         child.kill(2) # keyboard interrupt
         child.expect(".*KeyboardInterrupt.*")
diff --git a/tox.ini b/tox.ini
index 6a79a2c..b6fe71a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,25 +1,26 @@
 [tox]
-envlist=py26,py32,py33,py27,py26,py26-old,py33-old
+envlist=py26,py32,py33,py27,py27-pexpect,py33-pexpect,py26,py26-old,py33-old
 
 [testenv]
 changedir=testing
 deps=pytest>=2.5.1
 commands= py.test --junitxml={envlogdir}/junit-{envname}.xml []
 
-[testenv:py27]
-deps=
-    pytest>=2.4.2
+[testenv:py27-pexpect]
+deps={[testenv]deps}
+    pexpect
+[testenv:py33-pexpect]
+deps={[testenv]deps}
     pexpect
 
 [testenv:py26-old]
 deps=
-    pytest==2.3.5
-    pexpect
+    pytest==2.4.2
 
 [testenv:py33-old]
 basepython = python3.3
 deps=
-    pytest==2.3.5
+    pytest==2.4.2
 
 [pytest]
 addopts = -rsfxX