diff --git a/stacks/tatlock.yml b/stacks/tatlock.yml
index d9c80cf..2b1a6ec 100644
--- a/stacks/tatlock.yml
+++ b/stacks/tatlock.yml
@@ -34,7 +34,7 @@ services:
       - REDIS_TIMEOUT=5
       # Features
       - ENABLE_BENCHMARKS=true
-      - CORS_ORIGINS=*
+      - CORS_ORIGINS=["*"]
       - PYTHONPATH=/app
 
     volumes: