diff --git a/pkgs/tools/nix/nixpkgs-fmt/default.nix b/pkgs/tools/nix/nixpkgs-fmt/default.nix
index 793f19e53329..b7f73c7eb795 100644
--- a/pkgs/tools/nix/nixpkgs-fmt/default.nix
+++ b/pkgs/tools/nix/nixpkgs-fmt/default.nix
@@ -17,5 +17,6 @@ rustPlatform.buildRustPackage rec {
     homepage = "https://nix-community.github.io/nixpkgs-fmt";
     license = licenses.asl20;
     maintainers = with maintainers; [ zimbatm ];
+    mainProgram = "nixpkgs-fmt";
   };
 }