diff --git a/src/qiniu.js b/src/qiniu.js
index 932c7184..f84eaa5a 100644
--- a/src/qiniu.js
+++ b/src/qiniu.js
@@ -1511,7 +1511,7 @@
 
                     // send statistics log
                     if (!op.disable_statistics_report) {
-                        var req_id = info.responseHeaders.match(/(X-Reqid\:\ )([\w\.\%-]*)/)[2];
+                        var req_id = info.responseHeaders.match(/(X-Reqid\:\ )([\w\.\%-]*)/i)[2];
                         var startAt = file._start_at ? file._start_at.getTime() : nowTime.getTime();
                         statisticsLogger.log(
                             info.status,
@@ -1823,4 +1823,4 @@
     global.Qiniu = Qiniu;
     global.QiniuJsSDK = QiniuJsSDK;
 
-})(window);
\ No newline at end of file
+})(window);