diff --git a/ops/nixos/lib/common.nix b/ops/nixos/lib/common.nix
index 0658a140f0..7b2638b102 100644
--- a/ops/nixos/lib/common.nix
+++ b/ops/nixos/lib/common.nix
@@ -23,7 +23,7 @@ in
   time.timeZone = mkDefault "Etc/UTC";
 
   environment.systemPackages = with pkgs; [
-    vim rxvt_unicode.terminfo rebuilder
+    vim rxvt_unicode.terminfo tmux rebuilder
     (mercurial.overridePythonAttrs (origAttrs: {
       propagatedBuildInputs = origAttrs.propagatedBuildInputs ++ [python3Packages.hg-evolve depot.nix.pkgs.hg-git];
     }))
@@ -77,4 +77,4 @@ in
   system.activationScripts.lukegb-hgrc = lib.stringAfter [ "users" "groups" ] ''
     ln -sfn ${./hgrc} /home/lukegb/.hgrc
   '';
-}
\ No newline at end of file
+}