diff --git a/.travis.yml b/.travis.yml
index 86a4e4a..54bfbf4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,5 +7,11 @@ python:
   - 3.5
   - nightly
 script:
-  - python setup.py install
+  - pip install --upgrade pip
+  - |
+    if [[ ${TRAVIS_PYTHON_VERSION:0:1} == '2' ]]; then
+      pip install pyasn1==0.0.11a0
+    fi
   - pip install -e '.[subjectAltName_support]'
+  - (cd /tmp && pip uninstall --yes ndg_httpsclient)
+  - python setup.py install
diff --git a/setup.py b/setup.py
index d566d50..03d81da 100644
--- a/setup.py
+++ b/setup.py
@@ -122,7 +122,7 @@
             ],
     },
     install_requires = ['PyOpenSSL'],
-    extras_require = {'subjectAltName_support': 'pyasn1'},
+    extras_require = {'subjectAltName_support': ['pyasn1>=0.1.1']},
     classifiers = [
         'Development Status :: 3 - Alpha',
         'Environment :: Console',