List python_cpp as failing on OS X
diff --git a/.travis.yml b/.travis.yml
index c5053df..9bc4d88 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -67,5 +67,9 @@
       env: CONFIG=ruby22
     - os: osx
       env: CONFIG=jruby
+    # https://github.com/google/protobuf/issues/1253 - Started failing when
+    # we moved to an OS X image that is 10.11.
+    - os: osx
+      env: CONFIG=python_cpp
 notifications:
   email: false