diff --git a/.travis.yml b/.travis.yml
index 29b146a9..017f878f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 language: c
 os: osx
 osx_image: xcode9.4
+before_install:
+  - brew install openssl
 install:
   - pip install -r requirements.txt
   - python setup.py install