diff --git a/flake/checks.nix b/flake/checks.nix
index 73e64d5..01d3c7a 100644
--- a/flake/checks.nix
+++ b/flake/checks.nix
@@ -15,6 +15,10 @@
             enable = true;
           };
 
+          nixf-diagnose = {
+            enable = true;
+          };
+
           nixpkgs-fmt = {
             enable = true;
           };