diff --git a/ansible/pre-deploy.yml b/ansible/pre-deploy.yml
index f575c38..f154e68 100644
--- a/ansible/pre-deploy.yml
+++ b/ansible/pre-deploy.yml
@@ -104,9 +104,9 @@
           DB_NAME: "gitea"
           DB_USER: "mariadb" # https://github.com/dokku/dokku-mariadb/issues/89
           DB_PASSWD: "{{ db_passwd }}"
-          DISABLE_REGISTRATION: true
+          DISABLE_REGISTRATION: "true"
           DOMAIN: "git.autonomic.zone"
-          INSTALL_LOCK: true
+          INSTALL_LOCK: "true"
           RUN_MODE: "prod"
           USER_GID: "{{ gitea_user_guid }}"
           USER_UID: "{{ gitea_user_uid }}"