diff --git a/infra/modules/service/main.tf b/infra/modules/service/main.tf
index 3f0a2b6b8..12617513a 100644
--- a/infra/modules/service/main.tf
+++ b/infra/modules/service/main.tf
@@ -46,7 +46,7 @@ locals {
     { name : "DB_SCHEMA", value : var.db_vars.connection_info.schema_name },
   ]
   cdn_environment_variables = local.enable_cdn ? [
-    { name : "CDN_URL", value : local.cdn_domain_name_env_var },
+    { name : "CDN_URL", value : "https://${local.cdn_domain_name_env_var}" },
   ] : []
   environment_variables = concat(
     local.base_environment_variables,