diff --git a/roles/gitlab/meta/main.yml b/roles/gitlab/meta/main.yml
index a341ca7..23c1af7 100644
--- a/roles/gitlab/meta/main.yml
+++ b/roles/gitlab/meta/main.yml
@@ -6,4 +6,4 @@ dependencies:
   - role: redis
   - role: postfix-null
     vars:
-      postfix_domain: {{ gitlab_url }}
+      postfix_domain: "{{ gitlab_url }}"