diff --git a/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadService.java b/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadService.java
index 8170c497433..5b26381ee79 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadService.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadService.java
@@ -869,6 +869,14 @@ private static void startService(Context context, Intent intent, boolean foregro
     }
   }
 
+  /**
+   * Clear all DownloadManagerHelper to restart the new service.
+   */
+  public static void clearDownloadManagerHelpers() {
+    downloadManagerHelpers.clear();
+  }
+
+
   private final class ForegroundNotificationUpdater {
 
     private final int notificationId;