diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index baa9db4..97acd83 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -48,6 +48,6 @@ beaker_xenial_agent:
  variables:
    BEAKER_set: docker/ubuntu-master-16.04
    BEAKER_TESTMODE: agent
-   BEAKER_debug: yes
+   BEAKER_debug: 'yes'
  script:
    -  bundle exec rake beaker