diff --git a/tox.ini b/tox.ini
index 11ead47..3dc49d0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,7 +5,6 @@ skip_missing_interpreters = True
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
-         PYTHONHASHSEED=0
 install_command =
   pip install {opts} {packages}
 commands = find . -type f -name "*.py[c|o]" -delete