diff --git a/pkgs/applications/window-managers/leftwm/default.nix b/pkgs/applications/window-managers/leftwm/default.nix
index bbf1cefacd4c..ea2a41413a08 100644
--- a/pkgs/applications/window-managers/leftwm/default.nix
+++ b/pkgs/applications/window-managers/leftwm/default.nix
@@ -41,5 +41,6 @@ rustPlatform.buildRustPackage rec {
     platforms = lib.platforms.linux;
     maintainers = with lib.maintainers; [ yanganto ];
     changelog = "https://github.com/leftwm/leftwm/blob/${version}/CHANGELOG.md";
+    mainProgram = "leftwm";
   };
 }