diff --git a/roles/web-app-espocrm/config/main.yml b/roles/web-app-espocrm/config/main.yml
index ccafa5ce..c130222e 100644
--- a/roles/web-app-espocrm/config/main.yml
+++ b/roles/web-app-espocrm/config/main.yml
@@ -18,7 +18,7 @@ server:
         unsafe-eval:    true
     whitelist:
       connect-src:
-        - {{ WEBSOCKET_PROTOCOL }}://espocrm.{{ PRIMARY_DOMAIN }}
+        - "{{ WEBSOCKET_PROTOCOL }}://espocrm.{{ PRIMARY_DOMAIN }}"
         - "data:"
       frame-src:
         - https://s.espocrm.com/