diff --git a/.travis/run.sh b/.travis/run.sh
index 971ce4896..ab2c7e966 100755
--- a/.travis/run.sh
+++ b/.travis/run.sh
@@ -2,10 +2,6 @@
 set -e
 set -x
 
-# This is required in order to get UTF-8 output inside of the subprocesses that
-# our tests use.
-export LC_CTYPE=en_US.UTF-8
-
 # We want to create the virtual environment here, but not actually run anything
 tox --notest
 
diff --git a/tox.ini b/tox.ini
index b9cd881fb..76ddee28d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,6 +2,10 @@
 envlist = docs, packaging, pep8, py3pep8, py26, py27, py32, py33, py34, pypy
 
 [testenv]
+setenv =
+    # This is required in order to get UTF-8 output inside of the subprocesses
+    # that our tests use.
+    LC_CTYPE = en_US.UTF-8
 deps = -r{toxinidir}/dev-requirements.txt
 commands = py.test --timeout 300 []
 install_command = python -m pip install --pre {opts} {packages}