diff --git a/.travis.yml b/.travis.yml
index 8190aff..5c9dbce 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,7 @@ language: python
 python:
   - "2.6"
   - "2.7"
+  - "pypy"
 
 install: "pip install -r requirements-test.txt"
 script: "py.test --doctest-modules boltons"
diff --git a/tox.ini b/tox.ini
index 0663c0d..a6c06ae 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27
+envlist = py27,pypy
 [testenv]
 deps = -rrequirements-test.txt
 commands = py.test --doctest-modules boltons