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-rw-r--r--third_party/nix/src/nix-channel/nix-channel.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/nix-channel/nix-channel.cc b/third_party/nix/src/nix-channel/nix-channel.cc
index 8afdc16ac0d0..5cc16d1b4b9a 100644
--- a/third_party/nix/src/nix-channel/nix-channel.cc
+++ b/third_party/nix/src/nix-channel/nix-channel.cc
@@ -113,7 +113,7 @@ static void update(const StringSet& channelNames) {
     std::smatch match;
     auto urlBase = baseNameOf(url);
     if (std::regex_search(urlBase, match, std::regex("(-\\d.*)$"))) {
-      cname = cname + (std::string)match[1];
+      cname = cname + std::string(match[1]);
     }
 
     std::string extraAttrs;