diff --git a/pkgs/development/python-modules/protonup-ng/default.nix b/pkgs/development/python-modules/protonup-ng/default.nix
index f79285ce96a7..62a7d2ce53c3 100644
--- a/pkgs/development/python-modules/protonup-ng/default.nix
+++ b/pkgs/development/python-modules/protonup-ng/default.nix
@@ -25,5 +25,6 @@ buildPythonPackage rec {
     description = "CLI program and API to automate the installation and update of GloriousEggroll's Proton-GE";
     license = licenses.gpl3Only;
     maintainers = with maintainers; [ Madouura ];
+    mainProgram = "protonup";
   };
 }