diff --git a/tox.ini b/tox.ini
index 97208f688..0b64cbbd3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,6 +11,9 @@ usedevelop = True
 install_command = pip install {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
+# Note the hash seed is set to 0 until designate can be tested with a
+# random hash seed successfully.
+setenv = PYTHONHASHSEED=0
 commands = python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:cover]