diff --git a/{{cookiecutter.repo_name}}/runtime.txt b/{{cookiecutter.repo_name}}/runtime.txt
index 40b97bf8..84c90354 100644
--- a/{{cookiecutter.repo_name}}/runtime.txt
+++ b/{{cookiecutter.repo_name}}/runtime.txt
@@ -1,3 +1,5 @@
 {% if cookiecutter.use_python2 == 'n' -%}
 python-3.5.1
+{% else %}
+python-2.7.10
 {%- endif %}