diff --git a/overlays/10-previews.nix b/overlays/10-previews.nix
index 514dee86..e98d260b 100644
--- a/overlays/10-previews.nix
+++ b/overlays/10-previews.nix
@@ -11,6 +11,6 @@ in
   home-assistant = unstable.home-assistant;
   nix-output-monitor = unstable.nix-output-monitor.overrideAttrs (old: {
     src = super.sources.nix-output-monitor;
-    buildInputs = old.buildInputs ++ (with unstable.haskellPackages; [ streamly optics generic-optics ]);
+    buildInputs = old.buildInputs ++ (with unstable.haskellPackages; [ streamly optics generic-optics these ]);
   });
 }