diff --git a/pkgs/by-name/tr/trunk-io/package.nix b/pkgs/by-name/tr/trunk-io/package.nix
index 6e965dc48b1e..51269ae99270 100644
--- a/pkgs/by-name/tr/trunk-io/package.nix
+++ b/pkgs/by-name/tr/trunk-io/package.nix
@@ -29,5 +29,6 @@ stdenv.mkDerivation (finalAttrs: {
     license = lib.licenses.unfree;
     platforms = lib.platforms.linux ++ lib.platforms.darwin;
     maintainers = with lib.maintainers; [ aaronjheng ];
+    mainProgram = "trunk";
   };
 })