diff --git a/hosts/nixos-testbed/configuration.nix b/hosts/nixos-testbed/configuration.nix
index ea2eac7..622d436 100755
--- a/hosts/nixos-testbed/configuration.nix
+++ b/hosts/nixos-testbed/configuration.nix
@@ -82,6 +82,7 @@
     # Waypipe provides the equivalent of X11 forwarding for Wayland.  This is a
     # VM, so it's very handy.
     pkgs.waypipe
+    pkgs.cachix
   ];
 
   services.openssh = {