diff --git a/src/shared/js/request.html b/src/shared/js/request.html
index b5c166fb..afce0648 100644
--- a/src/shared/js/request.html
+++ b/src/shared/js/request.html
@@ -125,7 +125,7 @@
 			this.fire('progress', detail);
 		},
 
-		_getProgressDetail(e) {
+		_getProgressDetail: function(e) {
 			var current = DataUtils.isDef(e.loaded) ? e.loaded : e.position;
 			var total = DataUtils.isDef(e.total) ? e.total : e.totalSize;