diff --git a/.github/workflows/deploy_fastapi_backend.yml b/.github/workflows/deploy_fastapi_backend.yml
index 663eea79..243c1c0c 100644
--- a/.github/workflows/deploy_fastapi_backend.yml
+++ b/.github/workflows/deploy_fastapi_backend.yml
@@ -51,5 +51,5 @@ jobs:
           SECRET_KEY: ${{ secrets.NEXTAUTH_SECRET }}
           ALGORITHM: 'HS256'
           PLAN_TRIGGER_BUCKET: 'retrofit-plan-inputs-${{ github.ref_name }}'
-          DOMAIN_NAME: "${{ toUpper(github.ref_name) }}_${{ secrets.DOMAIN_NAME }}"
+          DOMAIN_NAME: "${{ github.ref_name }}_${{ secrets.DOMAIN_NAME }}"
         run: cd backend && sls deploy --stage ${{ github.ref_name }} --verbose