diff --git a/testinfra/test_ami_nix.py b/testinfra/test_ami_nix.py
index 85d3497ac..9cb46f4a3 100644
--- a/testinfra/test_ami_nix.py
+++ b/testinfra/test_ami_nix.py
@@ -316,7 +316,7 @@ def gzip_then_base64_encode(s: str) -> str:
 runcmd:
     - 'sudo echo \"pgbouncer\" \"postgres\" >> /etc/pgbouncer/userlist.txt'
     - 'cd /tmp && aws s3 cp --region ap-southeast-1 s3://init-scripts-staging/project/init.sh .'
-    - 'bash init.sh "staging"'
+    - 'USE_LEGACY_INT_CA_SECRET=true bash init.sh "staging"'
     - 'touch /var/lib/init-complete'
     - 'rm -rf /tmp/*'
 users: