diff --git a/backend/serverless.yml b/backend/serverless.yml
index 144939fb..974d9c59 100644
--- a/backend/serverless.yml
+++ b/backend/serverless.yml
@@ -29,7 +29,7 @@ custom:
     dockerSsh: true
     fileName: requirements/base.txt
   customDomain:
-    domainName: api-${self:provider.stage}.${self:provider.environment.DOMAIN_NAME}
+    domainName: api-${self:provider.ENVIRONMENT}.${self:provider.environment.DOMAIN_NAME}
     stage: ${self:provider.stage}
     createRoute53Record: true
     certificateArn: ${ssm:/ssl_certificate_arn~true}