diff --git a/os/remote-builds/default.nix b/os/remote-builds/default.nix
index 2672e3f..d0f46cc 100644
--- a/os/remote-builds/default.nix
+++ b/os/remote-builds/default.nix
@@ -33,6 +33,9 @@ in
         cat ${pkgs.writeText "root-ssh-config" (lib.strings.concatLines (builtins.map (builder: ''
         Host ${builder.hostName}
           Port 2278
+          ControlMaster auto
+          ControlPath ~/.ssh/master-%r@%n:%p
+          ControlPersist 60s
         '') vivariumBuilders)) } > /root/.ssh/config
       '';
     };