diff --git a/pkgs/by-name/ni/nix-index-unwrapped/package.nix b/pkgs/by-name/ni/nix-index-unwrapped/package.nix
index b0d3b6eb9163..69e4a781a6d1 100644
--- a/pkgs/by-name/ni/nix-index-unwrapped/package.nix
+++ b/pkgs/by-name/ni/nix-index-unwrapped/package.nix
@@ -46,5 +46,6 @@ rustPlatform.buildRustPackage rec {
       bennofs
       ncfavier
     ];
+    mainProgram = "nix-index";
   };
 }