diff --git a/.github/workflows/tox.yml b/.github/workflows/tox.yml
index 520cd47..1c8b66c 100644
--- a/.github/workflows/tox.yml
+++ b/.github/workflows/tox.yml
@@ -88,7 +88,8 @@ jobs:
       - name: Install and run tox
         env:
           TOXENV: pg-only
-          DATABASE_URL: postgres://${{env.POSTGRES_USER}}:${{env.POSTGRES_PASSWORD}}@${{env.POSTGRES_HOST}}:${{env.POSTGRES_PORT}}/${{env.POSTGRES_DBNAME}}
+          DATABASE_URL: postgres://$POSTGRES_USER:$POSTGRES_PASSWORD@$POSTGRES_HOST:$POSTGRES_PORT/$POSTGRES_DBNAME
         run: |
+          export
           pip install tox
           tox