diff --git a/.travis.yml b/.travis.yml
index 6ff9eed9c..8d73e7571 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,7 +33,7 @@ install:
   - pip install .
 
 script:
+  - pip install mock pylint
   - ./run_pylint.sh
-  - pip install mock trial
   - ./run_tests.sh
   - rvm use 2.3.1 && gem install danger --version '~> 4.0' && danger; fi
diff --git a/run_pylint.sh b/run_pylint.sh
index daf9dc922..c54cf0a44 100755
--- a/run_pylint.sh
+++ b/run_pylint.sh
@@ -1,5 +1,6 @@
 #! /bin/bash
 
+set -eu
 
 # Ignoring distutils because: https://github.com/PyCQA/pylint/issues/73
 # TODO: as code quality improves, make pylint be more strict