diff --git a/readthedocs.yml b/readthedocs.yml
index 1aaa175cf..777d01a1b 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -1,7 +1,7 @@
 build:
   image: latest
 python:
-  version: 3.6
+  version: 2.7
   pip_install: true
   extra_requirements:
   - docs
diff --git a/src/virtualenv.py b/src/virtualenv.py
index 8c0f5e5fc..3521583f1 100755
--- a/src/virtualenv.py
+++ b/src/virtualenv.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 """Create a "virtual" Python installation"""
-
+raise ValueError
 # fmt: off
 import os  # isort:skip
 import sys  # isort:skip