diff --git a/.travis.yml b/.travis.yml
index 41d59ff..ff01a91 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,6 +24,17 @@ matrix:
       install: pip install ".[test]" --user
       script: python -m pytest  # pytest command won't be found
       after_success: python  -m codecov  # codecov command won't be found
+    - name: "Python 3.5 on macOS 10.12"
+      os: osx
+      osx_image: xcode8.3  # Python 3.5 running on macOS 10.12
+      language: shell       # 'language: python' is an error on Travis CI macOS
+      before_install:
+        - python3 --version
+        - pip3 install -U pip
+        - pip3 install -U pytest
+        - pip3 install codecov
+      script: python3 -m pytest
+      after_success: python 3 -m codecov
     - name: "Python 3.6.5 on macOS 10.13"
       os: osx
       osx_image: xcode9.4  # Python 3.6.5 running on macOS 10.13