diff --git a/behat.yml b/behat.yml
index f092b55..bb099bd 100644
--- a/behat.yml
+++ b/behat.yml
@@ -17,5 +17,5 @@ default:
       browser_name: chrome
     SilverStripe\BehatExtension\Extension:
       bootstrap_file: vendor/silverstripe/cms/tests/behat/serve-bootstrap.php
-      screenshot_path: %paths.base%/artifacts/screenshots
+      screenshot_path: '%paths.base%/artifacts/screenshots'
       retry_seconds: 4 # default is 2