diff --git a/requirements-test.txt b/requirements-test.txt
index c716b2f9..ea06248f 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -5,3 +5,4 @@ pytest-cov==2.5.1
 tox==2.9.1
 virtualenv==15.0.2
 tox-virtualenv-no-download==1.0.2
+xdoctest==0.10.0
diff --git a/tox.ini b/tox.ini
index a70437d4..27c0fae1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,4 +3,4 @@ envlist = py26,py27,py34,py37,pypy
 [testenv]
 changedir = .tox
 deps = -rrequirements-test.txt
-commands = py.test --doctest-modules {envsitepackagesdir}/boltons {toxinidir}/tests {posargs}
+commands = py.test --xdoctest-modules {envsitepackagesdir}/boltons {toxinidir}/tests {posargs}