diff --git a/.travis.yml b/.travis.yml
index a4340c8..37ce3c5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,7 +15,7 @@ addons:
 dist: trusty
 sudo: false
 language: c
-script: make && make test
+script: CFLAGS=-Werror make && make test
 compiler:
     - gcc
     - clang