diff --git a/SDWebImage/Core/SDWebImageDownloader.m b/SDWebImage/Core/SDWebImageDownloader.m
index d7deee95..3d354add 100644
--- a/SDWebImage/Core/SDWebImageDownloader.m
+++ b/SDWebImage/Core/SDWebImageDownloader.m
@@ -514,6 +514,7 @@ didReceiveResponse:(NSURLResponse *)response
 
 - (void)dealloc {
     [[NSNotificationCenter defaultCenter] removeObserver:self name:SDWebImageDownloadReceiveResponseNotification object:nil];
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:SDWebImageDownloadStopNotification object:nil];
 }
 
 - (instancetype)initWithDownloadOperation:(NSOperation<SDWebImageDownloaderOperation> *)downloadOperation {