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-rw-r--r--src/libstore/download.hh3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/libstore/download.hh b/src/libstore/download.hh
index 7ade756fc356..01940f5447fe 100644
--- a/src/libstore/download.hh
+++ b/src/libstore/download.hh
@@ -42,8 +42,7 @@ struct Downloader
        the download. The future may throw a DownloadError
        exception. */
     virtual void enqueueDownload(const DownloadRequest & request,
-        std::function<void(const DownloadResult &)> success,
-        std::function<void(std::exception_ptr exc)> failure) = 0;
+        Callback<DownloadResult> callback) = 0;
 
     std::future<DownloadResult> enqueueDownload(const DownloadRequest & request);