diff --git a/tox.ini b/tox.ini
index 02dac23a..6e03d486 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,6 @@ skipdist = True
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
-         PYTHONHASHSEED=0
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = python setup.py testr --testr-args='{posargs}'