diff --git a/treefmt.nix b/treefmt.nix
index d5869ec3..ec16ae83 100644
--- a/treefmt.nix
+++ b/treefmt.nix
@@ -24,5 +24,10 @@
       "*.toml"
     ];
   };
-  programs.rustfmt.enable = true;
+  programs.rustfmt = {
+    enable = true;
+    includes = [
+      "*.rs"
+    ];
+  };
 }