diff --git a/.travis.yml b/.travis.yml
index 4f94b77..572107e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -36,8 +36,7 @@ script:
   - "ansible-playbook main.yml --syntax-check"
 
   # Test the playbook.
-  - >
-    travis_wait 30 ansible-playbook --extra-vars '{"configure_sudoers":"false"}' main.yml
+  - "travis_wait 30 ansible-playbook --extra-vars 'configure_sudoers=False' main.yml"
 
   # Test the playbook's idempotence.
   - idempotence=$(mktemp)