diff --git a/common/frontend_server/index.mjs b/common/frontend_server/index.mjs
index d0871cfa..b44b2f81 100644
--- a/common/frontend_server/index.mjs
+++ b/common/frontend_server/index.mjs
@@ -69,7 +69,7 @@ export default async function(opts) {
       next();
     }
   });
-  const prod = process.env.NODE_ENV !== 'production';
+  const prod = process.env.NODE_ENV === 'production';
 
   const port = prod ? (process.env.PORT || 8086) : opts.port;