diff --git a/_config/cdn.yml b/_config/cdn.yml
index 97ffced..f07b952 100644
--- a/_config/cdn.yml
+++ b/_config/cdn.yml
@@ -7,4 +7,4 @@ SilverStripe\Core\Injector\Injector:
   SilverStripe\Control\Director:
     properties:
       Middlewares:
-        CustomCDNMiddleware: %$DorsetDigital\CDNRewrite\CDNMiddleware
+        CustomCDNMiddleware: '%$DorsetDigital\CDNRewrite\CDNMiddleware'