diff --git a/config/silverstripe.yml b/config/silverstripe.yml
index b1668d3..41a4e17 100644
--- a/config/silverstripe.yml
+++ b/config/silverstripe.yml
@@ -17,13 +17,13 @@ parameters:
   silverstripe_extension.context.class_path: tests/behat/src/
 services:
   silverstripe_extension.context.initializer:
-    class: %silverstripe_extension.context.initializer.class%
+    class: '%silverstripe_extension.context.initializer.class%'
     calls:
-      - [setAjaxSteps, [%silverstripe_extension.ajax_steps%]]
-      - [setAjaxTimeout, [%silverstripe_extension.ajax_timeout%]]
-      - [setAdminUrl, [%silverstripe_extension.admin_url%]]
-      - [setLoginUrl, [%silverstripe_extension.login_url%]]
-      - [setScreenshotPath, [%silverstripe_extension.screenshot_path%]]
-      - [setRegionMap, [%silverstripe_extension.region_map%]]
+      - [setAjaxSteps, ['%silverstripe_extension.ajax_steps%']]
+      - [setAjaxTimeout, ['%silverstripe_extension.ajax_timeout%']]
+      - [setAdminUrl, ['%silverstripe_extension.admin_url%']]
+      - [setLoginUrl, ['%silverstripe_extension.login_url%']]
+      - [setScreenshotPath, ['%silverstripe_extension.screenshot_path%']]
+      - [setRegionMap, ['%silverstripe_extension.region_map%']]
     tags:
       - { name: context.initializer }
diff --git a/templates/config-base.yml b/templates/config-base.yml
index 381a17a..c2bfafc 100644
--- a/templates/config-base.yml
+++ b/templates/config-base.yml
@@ -7,4 +7,4 @@ default:
       selenium2:
         browser: firefox
     SilverStripe\BehatExtension\Extension:
-      screenshot_path: %paths.base%/artifacts/screenshots
+      screenshot_path: '%paths.base%/artifacts/screenshots'