diff --git a/pkgs/misc/acpilight/default.nix b/pkgs/misc/acpilight/default.nix
index d6fead938a45..91bb87829131 100644
--- a/pkgs/misc/acpilight/default.nix
+++ b/pkgs/misc/acpilight/default.nix
@@ -29,5 +29,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl3;
     maintainers = with maintainers; [ smakarov ];
     platforms = platforms.linux;
+    mainProgram = "xbacklight";
   };
 }