diff --git a/pkgs/games/system-syzygy/default.nix b/pkgs/games/system-syzygy/default.nix
index 2e417e2a3cfc..4343a27fb499 100644
--- a/pkgs/games/system-syzygy/default.nix
+++ b/pkgs/games/system-syzygy/default.nix
@@ -3,7 +3,7 @@
 let
   desktopFile = makeDesktopItem {
     name = "system-syzygy";
-    exec = "%out%/bin/syzygy";
+    exec = "@out@/bin/syzygy";
     comment = "A puzzle game";
     desktopName = "System Syzygy";
     categories = "Game;";