diff --git a/overlays/10-previews.nix b/overlays/10-previews.nix
index 5cd401b6..5ac6305f 100644
--- a/overlays/10-previews.nix
+++ b/overlays/10-previews.nix
@@ -12,7 +12,7 @@ in
   vscode-extensions = unstable.vscode-extensions;
   vscode = unstable.vscode;
   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 ]);
+    src = super.sources.nix-output-monitor;
+    buildInputs = old.buildInputs ++ (with unstable.haskellPackages; [ streamly optics generic-optics extra safe ]);
   });
 }