diff --git a/docker/testing/compose.yml b/docker/testing/compose.yml
index de4a71fea..28ec055c1 100644
--- a/docker/testing/compose.yml
+++ b/docker/testing/compose.yml
@@ -47,6 +47,7 @@ services:
       - NEXT_PRIVATE_SMTP_PASSWORD=password
       - NEXT_PRIVATE_SMTP_FROM_NAME="No Reply @ Documenso"
       - NEXT_PRIVATE_SMTP_FROM_ADDRESS=noreply@documenso.com
+      - NEXT_PRIVATE_SIGNING_LOCAL_FILE_PATH=/opt/documenso/cert.p12
     ports:
       - 3000:3000
     volumes: