make sure not to use cached channels for nix-channel --update

fixes #1964

1 files changed, 1 insertions, 1 deletions

diff --git a/src/nix-channel/nix-channel.cc b/src/nix-channel/nix-channel.cc
index d1b47ede803f..55ebda438965 100755
--- a/src/nix-channel/nix-channel.cc
+++ b/src/nix-channel/nix-channel.cc
@@ -86,7 +86,7 @@ static void update(const StringSet & channelNames)
         // definition from a consistent location if the redirect changes mid-download.
         std::string effectiveUrl;
         auto dl = getDownloader();
-        auto filename = dl->downloadCached(store, url, false, "", Hash(), &effectiveUrl);
+        auto filename = dl->downloadCached(store, url, false, "", Hash(), &effectiveUrl, 0);
         url = chomp(std::move(effectiveUrl));
 
         // If the URL contains a version number, append it to the name