diff --git a/app/src/main/java/com/hippo/ehviewer/download/DownloadManager.kt b/app/src/main/java/com/hippo/ehviewer/download/DownloadManager.kt
index 67f6c2a5b..6b71a504f 100644
--- a/app/src/main/java/com/hippo/ehviewer/download/DownloadManager.kt
+++ b/app/src/main/java/com/hippo/ehviewer/download/DownloadManager.kt
@@ -102,7 +102,7 @@ object DownloadManager : OnSpiderListener {
             }
             list.add(info)
             info.gid
-        }.toMutableMap()
+        } as MutableMap<Long, DownloadInfo>
         mWaitList = LinkedList()
         mSpeedReminder = SpeedReminder()
         mDownloadInfoListeners = ArrayList()