diff --git a/tox.ini b/tox.ini
index 9389cf4..c631787 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,12 +12,15 @@
 install_command = pip install -U {opts} {packages}
 
 [testenv:py26]
+setenv = OS_TEST_PATH=./tempest/tests
 commands = python setup.py test --slowest --testr-arg='tempest\.tests {posargs}'
 
 [testenv:py33]
+setenv = OS_TEST_PATH=./tempest/tests
 commands = python setup.py test --slowest --testr-arg='tempest\.tests {posargs}'
 
 [testenv:py27]
+setenv = OS_TEST_PATH=./tempest/tests
 commands = python setup.py test --slowest --testr-arg='tempest\.tests {posargs}'
 
 [testenv:all]