Fix segfault in headerCallback()

https://hydra.nixos.org/build/168594664

1 files changed, 1 insertions, 1 deletions

diff --git a/src/nix-channel/nix-channel.cc b/src/nix-channel/nix-channel.cc
index f46b90b90..cf52b03b4 100755
--- a/src/nix-channel/nix-channel.cc
+++ b/src/nix-channel/nix-channel.cc
@@ -96,7 +96,7 @@ static void update(const StringSet & channelNames)
         std::smatch match;
         auto urlBase = std::string(baseNameOf(url));
         if (std::regex_search(urlBase, match, std::regex("(-\\d.*)$")))
-            cname = cname + (std::string) match[1];
+            cname = cname + match.str(1);
 
         std::string extraAttrs;