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-rw-r--r--src/libstore/download.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/download.hh b/src/libstore/download.hh
index 1f6098759a2d..08618ba1c95d 100644
--- a/src/libstore/download.hh
+++ b/src/libstore/download.hh
@@ -29,7 +29,7 @@ struct Downloader
 {
     virtual DownloadResult download(string url, const DownloadOptions & options) = 0;
 
-    Path downloadCached(ref<Store> store, const string & url, bool unpack,
+    Path downloadCached(ref<Store> store, const string & url, bool unpack, string name = "",
         const Hash & expectedHash = Hash());
 
     enum Error { NotFound, Forbidden, Misc, Transient };