diff --git a/kubernetes/apps/clusterissuer/app/release.yaml b/kubernetes/apps/clusterissuer/app/release.yaml
index aaac1f3..83f2510 100644
--- a/kubernetes/apps/clusterissuer/app/release.yaml
+++ b/kubernetes/apps/clusterissuer/app/release.yaml
@@ -79,4 +79,4 @@ spec:
         certificateIssuer: ACME
         hosts:
           - ${cluster_cert_domain}
-          - ${cluster_cert_domain_wildcard}
\ No newline at end of file
+          - "${cluster_cert_domain_wildcard}"
\ No newline at end of file