diff --git a/tox.ini b/tox.ini
index 39a1638..7365f31 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,8 +4,10 @@ envlist = py{26,27,34,py,py3}, docs, style
 
 [testenv]
 changedir = {envtmpdir}
+setenv =
+    JSON_SCHEMA_TEST_SUITE = {toxinidir}/json
 commands =
-    green [] {toxinidir}/jsonschema
+    green [] jsonschema
     {envpython} -m doctest {toxinidir}/README.rst
     py{26,27,34}: sphinx-build -b doctest {toxinidir}/docs {envtmpdir}/html
 deps =
@@ -23,7 +25,7 @@ deps =
 
 [testenv:coverage]
 commands =
-    coverage run --branch --source {toxinidir}/jsonschema [] {envbindir}/green {toxinidir}/jsonschema
+    coverage run --branch --source {toxinidir}/jsonschema [] {envbindir}/green jsonschema
     coverage report --show-missing
     coverage html
 deps =