diff --git a/pkgs/tools/X11/caffeine-ng/default.nix b/pkgs/tools/X11/caffeine-ng/default.nix
index 4f709ee9db08..8493d312eb47 100644
--- a/pkgs/tools/X11/caffeine-ng/default.nix
+++ b/pkgs/tools/X11/caffeine-ng/default.nix
@@ -43,6 +43,7 @@ python3Packages.buildPythonApplication rec {
   '';
 
   meta = with lib; {
+    mainProgram = "caffeine";
     maintainers = with maintainers; [ marzipankaiser ];
     description = "Status bar application to temporarily inhibit screensaver and sleep mode";
     homepage = "https://github.com/caffeine-ng/caffeine-ng";