diff --git a/dio/lib/src/adapters/browser_adapter.dart b/dio/lib/src/adapters/browser_adapter.dart
index 1dc1c1af2..7fba8f944 100644
--- a/dio/lib/src/adapters/browser_adapter.dart
+++ b/dio/lib/src/adapters/browser_adapter.dart
@@ -47,8 +47,9 @@ class BrowserHttpClientAdapter implements HttpClientAdapter {
     }
 
     var completer = Completer<ResponseBody>();
-
+    bool haveSent = false;
     xhr.onLoad.first.then((_) {
+      haveSent = true;
       Uint8List body = (xhr.response as ByteBuffer).asUint8List();
       completer.complete(
         ResponseBody.fromBytes(
@@ -61,8 +62,6 @@ class BrowserHttpClientAdapter implements HttpClientAdapter {
       );
     });
 
-    bool haveSent = false;
-
     if (options.connectTimeout > 0) {
       Future.delayed(Duration(milliseconds: options.connectTimeout)).then(
         (value) {