diff --git a/src/nix/sigs.cc b/src/nix/sigs.cc
index 142421e9c..b5ad0c133 100644
--- a/src/nix/sigs.cc
+++ b/src/nix/sigs.cc
@@ -3,6 +3,7 @@
 #include "nix/main/shared.hh"
 #include "nix/store/store-open.hh"
 #include "nix/util/thread-pool.hh"
+#include "nix/store/filetransfer.hh"
 
 #include <atomic>
 
@@ -38,7 +39,7 @@ struct CmdCopySigs : StorePathsCommand
         for (auto & s : substituterUris)
             substituters.push_back(openStore(s));
 
-        ThreadPool pool;
+        ThreadPool pool{fileTransferSettings.httpConnections};
 
         std::atomic<size_t> added{0};