diff --git a/tox/session.py b/tox/session.py
index 4844ce1e8..081c417a7 100644
--- a/tox/session.py
+++ b/tox/session.py
@@ -16,10 +16,6 @@
 from tox.config import parseconfig
 from tox.result import ResultLog
 from subprocess import STDOUT
-try:
-    FileNotFoundError
-except NameError:
-    FileNotFoundError = IOError
 
 
 def now():