diff --git a/server/middlewares/csp.js b/server/middlewares/csp.js
index 0008b65511..f069aa9b00 100644
--- a/server/middlewares/csp.js
+++ b/server/middlewares/csp.js
@@ -5,7 +5,7 @@ let trusted = [
 ];
 
 const host = process.env.HOST || 'localhost';
-const port = process.env.PORT || process.env.SYNC_PORT || '3000';
+const port = process.env.SYNC_PORT || '3000';
 
 if (process.env.NODE_ENV !== 'production') {
   trusted = trusted.concat([