diff --git a/.github/workflows/Linux.yml b/.github/workflows/Linux.yml
index 63e3136c..c665652a 100644
--- a/.github/workflows/Linux.yml
+++ b/.github/workflows/Linux.yml
@@ -25,6 +25,7 @@ jobs:
     env:
       TEST_LOCAL: 1
       TEST_PREFERRED_CHAIN: (STAGING) Pretend Pear X1
+      TEST_ACME_Server: "LetsEncrypt.org_test"
     steps:
     - uses: actions/checkout@v2
     - name: Clone acmetest