diff --git a/tox.ini b/tox.ini
index 39fe024..6114311 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@
     coverage
     pretend
 commands =
-    coverage run --source=cryptography/,tests/ -m pytest --strict
+    coverage run --source=cryptography/,tests/ -m pytest --capture=no --strict
     coverage report -m
 
 [testenv:docs]
@@ -24,7 +24,7 @@
 # Temporarily disable coverage on pypy because of performance problems with
 # coverage.py on pypy.
 [testenv:pypy]
-commands = py.test
+commands = py.test --capture=no
 
 [testenv:pep8]
 deps = flake8