diff --git a/cobalt/loader/cors_preflight.cc b/cobalt/loader/cors_preflight.cc
index 980f4d971f1b..f7faf18d91c3 100644
--- a/cobalt/loader/cors_preflight.cc
+++ b/cobalt/loader/cors_preflight.cc
@@ -244,6 +244,9 @@ bool CORSPreflight::IsPreflightNeeded() {
   if (force_preflight_) {
     return true;
   }
+  if (cors_policy_ == network::kCORSOptional) {
+    return false;
+  }
   // Preflight is not needed if the request method is CORS-safelisted request
   // method and all headers are CORS-safelisted request-header.
   std::vector<std::string> unsafe_headers;