diff --git a/pkgs/applications/window-managers/i3/lock-fancy-rapid.nix b/pkgs/applications/window-managers/i3/lock-fancy-rapid.nix
index 654841c7ffce..84b1800b1f9d 100644
--- a/pkgs/applications/window-managers/i3/lock-fancy-rapid.nix
+++ b/pkgs/applications/window-managers/i3/lock-fancy-rapid.nix
@@ -33,6 +33,7 @@ stdenv.mkDerivation {
     description = "Faster implementation of i3lock-fancy";
     homepage = "https://github.com/yvbbrjdr/i3lock-fancy-rapid";
     maintainers = with maintainers; [ nickhu ];
+    mainProgram = "i3lock-fancy-rapid";
     license = licenses.bsd3;
     platforms = platforms.linux;
   };